diff --git a/ROADMAP.md b/ROADMAP.md
index 249f287f99..6634121a2c 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -237,6 +237,7 @@ Ranked, to beta (detail and remaining milestones in [docs/roadmap.md](docs/roadm
 - 2026-11-03: Find and Replace: a keyboard apostrophe also finds typographic single quotes, so smart-quoted typing stays searchable (#5388). Regex, wildcards, literal searches and numeric character codes remain exact. Original UTF-8 match ranges and replacement spelling are preserved; readiness unchanged.
 - 2026-11-03: Security: XLSX import finds each sheet's worksheet part through an index of the workbook's relationships, built once, instead of searching every relationship for every sheet. Readiness unchanged.
 - 2026-11-03: Layout: a row of a nested table marked Can't Split isn't split with its outer row any more. The outer row moves to the next page whole when that row comes first in it, as Word does (docxide-pdf `nested-first-row-*-cant1`), and otherwise splits above it (inferred, not yet checked in Word); on a fresh page a nested row taller than the room still splits rather than running into the margin. Readiness unchanged.
+- 2026-11-03: Layout: no line break between a full stop and an opening parenthesis. UAX #14 allows one there, Word doesn't: `29.05.2023г.(оформление ЗУ)` and `2023.(Example detail)` now wrap whole at the space before, as in the docxide-pdf `dot-open-token*` Word references. Readiness unchanged.
 - 2026-11-03: Security: pasting text boxes charges each copied story for its formatting too (run, mark, paragraph and section properties), not only its text and objects, so a story with huge style or font names can't copy past the paste's 32 MiB text box budget. Readiness unchanged.
 - 2026-11-03: Security: `.doc` import keeps one width, shading, alignment and merge override per table cell, the last one winning as before, instead of a copy every time a paragraph's properties repeat the sprm, so a shared PAPX can't pile up copies on every paragraph mark. Readiness unchanged.
 - 2026-11-03: Security: `.doc` import attaches each section to the paragraph that ends it through an index of paragraph ends, instead of scanning every paragraph for every section, so a file with a thousand sections that end nowhere can't multiply the work over its paragraphs. Readiness unchanged.
@@ -914,6 +915,7 @@ MATH glyphs that reference the same construction now share its immutable variant
 | 2026-11-03 | trivial | Find smart-quoted text with a keyboard apostrophe (#5388); exact search modes and replacement spelling preserved. |
 | 2026-11-03 | trivial | Progress log: a picture in a paragraph whose hidden mark closes a section keeps its room (#5288) |
 | 2026-11-03 | trivial | Progress log: a nested table's Can't Split row moves on with its outer row |
+| 2026-11-03 | trivial | Progress log: no line break between a full stop and an opening parenthesis |
 | 2026-11-03 | trivial | Progress log: Replace and Remove Table of Contents with Word's title above a section break (#4041) |
 | 2026-11-03 | trivial | Progress log: language-packs-2 published and pinned, 75 Language packs |
 | 2026-11-02 | trivial | Progress log: language-packs-1 published and pinned, 61 Language packs (CP4.4) |
diff --git a/crates/layout/src/para/paragraph.rs b/crates/layout/src/para/paragraph.rs
index f844e541ab..1d024219d7 100644
--- a/crates/layout/src/para/paragraph.rs
+++ b/crates/layout/src/para/paragraph.rs
@@ -864,6 +864,9 @@ fn break_positions(text: &str, rp: &wordcraft_doc::resolve::ResolvedPara) -> Vec
         found.sort_unstable();
         found.dedup();
     }
+    // UAX #14 breaks between a full stop and an opening parenthesis; Word keeps
+    // "2023.(Example" whole and wraps it at the space before.
+    found.retain(|&i| !(text.get(..i).is_some_and(|t| t.ends_with('.')) && text.get(i..).is_some_and(|t| t.starts_with('('))));
     // Asian typography: kinsoku and breaking Latin words anywhere.
     crate::kinsoku::apply(text, &mut found, rp.kinsoku, rp.word_wrap);
     found
diff --git a/crates/layout/src/tests.rs b/crates/layout/src/tests.rs
index 2b1c4eb15b..4acda0f5fe 100644
--- a/crates/layout/src/tests.rs
+++ b/crates/layout/src/tests.rs
@@ -13679,6 +13679,36 @@ fn a_hyphen_before_a_slash_is_a_break_opportunity_like_word() {
     panic!("no width in the sweep wrapped the paragraph");
 }
 
+/// docxide-pdf `dot-open-token*`: UAX #14 allows a break between a full stop and an opening
+/// parenthesis, Word doesn't. The first width that wraps `Deed 2023.(Example` breaks at the space.
+#[test]
+fn a_full_stop_before_a_parenthesis_is_no_break() {
+    let text = "Deed 2023.(Example";
+    for m in 100..=540 {
+        let mut d = Document::from_text(text);
+        d.last_section.margin_right = m as f32;
+        let l = lay(&d);
+        let lines: Vec<String> = l.pages[0]
+            .items
+            .iter()
+            .filter_map(|it| {
+                if let Placed::Lines { para, l0, l1, .. } = it {
+                    Some(para.lines[*l0..*l1].iter().map(|line| text[line.start..line.stop].to_string()).collect::<Vec<_>>())
+                } else {
+                    None
+                }
+            })
+            .flatten()
+            .collect();
+        if lines.len() < 2 {
+            continue; // still fits on one line at this width
+        }
+        assert_eq!(lines, ["Deed ", "2023.(Example"], "the first wrap breaks at the space");
+        return;
+    }
+    panic!("no width in the sweep wrapped the paragraph");
+}
+
 #[test]
 fn layout_cache_invalidates_on_changed_filename() {
     let mut doc = Document::new();
diff --git a/docs/gaps.md b/docs/gaps.md
index cae60f28b0..e4ed791d1b 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -87,6 +87,7 @@ Page drawing indexes text-box warp lookups by paragraph and story for the curren
 | 4 | **Pagination differs from Word**: Aptos has no metric-matched substitute; legacy compatibility options only partially covered; no page-by-page comparison harness | B | SECTIONPAGES now counts shared continuous-section pages in body and header/footer fields; legacy same-style cell spacing preserved for measured modes 11/12/14, with mode 15 and non-cell controls; Contextual spacing corrected in body/header probes and repeated table-cell runs; [layout-parity.md](layout-parity.md); [typing-parity.md](typing-parity.md) Known gaps; non-overlapping body floating tables clear header tables; stray labels on page-break-only list paragraphs fixed multi-paragraph field-code blank lines fixed; centred numbered heading labels after leading page breaks fixed (#2964); Arial Unicode MS no longer selects monospace substitutes; a slash opening a word travels whole to the next line (#2963) A right, centre or decimal tab whose text doesn't fit, or a left tab past the right indent, goes to the next line with its text, so a TOC entry's page number keeps its leader (#1840). Page break before now applies at a continuous section's mid-page top (#5287); the later-column case remains unmeasured in Word. | Page counts and line breaks differ, which matters for forms, legal and academic work | 30–50 + owner (font) | [layout-parity.md](layout-parity.md) |
 | 4 | **Pagination differs from Word**: Aptos has no metric-matched substitute; legacy compatibility options only partially covered; no page-by-page comparison harness | B | SECTIONPAGES now counts shared continuous-section pages in body and header/footer fields; legacy same-style cell spacing preserved for measured modes 11/12/14, with mode 15 and non-cell controls; Contextual spacing corrected in body/header probes and repeated table-cell runs; [layout-parity.md](layout-parity.md); [typing-parity.md](typing-parity.md) Known gaps; non-overlapping body floating tables clear header tables; stray labels on page-break-only list paragraphs fixed multi-paragraph field-code blank lines fixed; centred numbered heading labels after leading page breaks fixed (#2964); Arial Unicode MS no longer selects monospace substitutes; a slash opening a word travels whole to the next line (#2963); a hyphen before a slash and a letter is also a break opportunity (#3408), while a hyphen before a slash and a digit stays whole A right, centre or decimal tab whose text doesn't fit, or a left tab past the right indent, goes to the next line with its text, so a TOC entry's page number keeps its leader (#1840). | Page counts and line breaks differ, which matters for forms, legal and academic work | 30–50 + owner (font) | [layout-parity.md](layout-parity.md) |
 | 4 | **Pagination differs from Word**: Aptos has no metric-matched substitute; legacy compatibility options only partially covered; no page-by-page comparison harness | B | SECTIONPAGES now counts shared continuous-section pages in body and header/footer fields; legacy same-style cell spacing preserved for measured modes 11/12/14, with mode 15 and non-cell controls; Contextual spacing corrected in body/header probes and repeated table-cell runs; [layout-parity.md](layout-parity.md); [typing-parity.md](typing-parity.md) Known gaps; non-overlapping body floating tables clear header tables; stray labels on page-break-only list paragraphs fixed multi-paragraph field-code blank lines fixed; centred numbered heading labels after leading page breaks fixed (#2964); Arial Unicode MS no longer selects monospace substitutes; a slash opening a word travels whole to the next line (#2963); a nested table's Can't Split row moves on with its outer row when the row splits across pages (#5456) A right, centre or decimal tab whose text doesn't fit, or a left tab past the right indent, goes to the next line with its text, so a TOC entry's page number keeps its leader (#1840). | Page counts and line breaks differ, which matters for forms, legal and academic work | 30–50 + owner (font) | [layout-parity.md](layout-parity.md) |
+| 4 | **Pagination differs from Word**: Aptos has no metric-matched substitute; legacy compatibility options only partially covered; no page-by-page comparison harness | B | SECTIONPAGES now counts shared continuous-section pages in body and header/footer fields; legacy same-style cell spacing preserved for measured modes 11/12/14, with mode 15 and non-cell controls; Contextual spacing corrected in body/header probes and repeated table-cell runs; [layout-parity.md](layout-parity.md); [typing-parity.md](typing-parity.md) Known gaps; non-overlapping body floating tables clear header tables; stray labels on page-break-only list paragraphs fixed multi-paragraph field-code blank lines fixed; centred numbered heading labels after leading page breaks fixed (#2964); Arial Unicode MS no longer selects monospace substitutes; a slash opening a word travels whole to the next line (#2963); a hyphen before a slash and a letter is also a break opportunity (#3408), while a hyphen before a slash and a digit stays whole; a full stop followed by an opening parenthesis stays on one line (#5437) A right, centre or decimal tab whose text doesn't fit, or a left tab past the right indent, goes to the next line with its text, so a TOC entry's page number keeps its leader (#1840). | Page counts and line breaks differ, which matters for forms, legal and academic work | 30–50 + owner (font) | [layout-parity.md](layout-parity.md) |
 | 2 | **Word's native ink is not drawn from its strokes**; OLE objects show only their picture | B | Every native ink form is preserved: drawing-level ink with its optional picture fallback, direct run-level content parts, and ink members of groups and drawing canvases (kept in their place among the members, drawn from their fallback picture). Drawing canvases are read and written (#344); group shapes (`wpg`) read and written (#267). Charts and SmartArt are drawn (#292) and, with OLE objects, written back with all their parts on save (#319) | Pen notes from Word show only as their picture and can't be edited; OLE objects can't be opened | 45–70 to render and edit charts and SmartArt (#13) | [file-format-parity.md](file-format-parity.md) |
 | 5 | **Content controls** landed (#381): `w:sdt` kept, shown and edited (Developer tab, Design Mode, Properties). Move tracking landed (#400): `w:moveFrom`/`w:moveTo` with their named ranges round-trip, a tracked cut and paste of a paragraph or sentence records a move, either end accepts/rejects both, green double strike/underline markup and "Moved from/to" balloons; Track Changes Options has the Moves rows (Moved from / Moved to mark and colour) and `w:doNotTrackMoves` (Track moves off: a cut and paste is a deletion and an insertion) round-trips; still missing: drag-and-drop moves (no text drag yet). Formatting revisions landed (#41): `w:rPrChange`/`w:pPrChange`/`w:tblPrChange`/`w:trPrChange`/`w:tcPrChange`/`w:sectPrChange`/`w:numberingChange` round-trip, are recorded while tracking, accepted/rejected and shown in balloons; still missing: tracked style-definition changes (table, row, cell and section property changes now record in WordCraft too, #41 follow-up). Opaque custom XML backing stores now survive saves; binding evaluation remains absent. Replace All now checks content-control locks before editing any match; a refused batch preserves the document and undo history. | B | List-label pitch corrected in synthetic metric controls; Issues #41, #400; source grep | Legal and editorial review workflows; templates with form controls | 5–8 | [file-format-parity.md](file-format-parity.md) |
 | 6 | **Print dialog depth**: desktop printer choice, copies, collation, duplex and grayscale submit through craft-print; File › Print retains preview, page ranges and odd/even (#641) and scales pages to another paper size (#2108); print-only N-up and booklets are available; driver tray/options remain; web prints through the browser (#209) | B | `ui.print` → `apps/wordcraft/src/print.rs`; issue #15 | Everyone who prints | 5–8 | [hardware-parity.md](hardware-parity.md) |
@@ -232,6 +233,7 @@ Page Setup's margin, paper-size and document-grid number boxes scroll long text
 | 2026-10-17 | trivial | UI/UX gaps: copies put RTF on the clipboard (Windows, macOS, Wayland; not X11), and paste reads RTF on macOS and X11 too |
 | 2026-11-03 | trivial | Find smart-quoted text with a keyboard apostrophe (#5388); exact search modes and replacement spelling preserved. |
 | 2026-11-03 | trivial | #4 narrowed: a nested table's Can't Split row moves on with its outer row when the row splits across pages (#5456); Word shows this for a nested row first in its outer row, the split above a later one is inferred and not yet checked in Word; readiness estimates unchanged |
+| 2026-11-03 | trivial | #4 narrowed: a full stop followed by an opening parenthesis stays on one line, as in Word (#5437) |
 | 2026-11-03 | minor | #11: Arabic interface with mirrored shell (#1195); key languages missing are now hi and id (plus pt-PT); Hebrew UI still open |
 | 2026-11-03 | trivial | #8 (CP4.3): one language list: Set Proofing Language, Review › Language and the status bar offer the Language pack languages (Bulgarian was in none); every published pack named in English; Valencian is `ca-ES-valencia`; gap 8 names built-in proofing |
 | 2026-11-03 | trivial | #8 (CP4.3): the missing-pack bar offers a language before the list of packs is fetched (a fresh install, or a list cached for an older pin) and gets it on Install; with downloading on, a missing or stale list is fetched once in the background; the caret's typing language counts; the spelling context menu's heading is in the interface language |
diff --git a/docs/layout-parity.md b/docs/layout-parity.md
index 8f57f85b0a..0034e76638 100644
--- a/docs/layout-parity.md
+++ b/docs/layout-parity.md
@@ -25,7 +25,7 @@ Exact line spacing keeps the run font baseline around tall equations; automatic
 | Hint-reliant CJK glyph outlines (DFKai-SB / 標楷體) | 🟡 | Required TrueType interpreter runs at units-per-em size; local Windows glyph-bounds regression and synthetic DOCX page/window comparison pass. Other platforms and hint-reliant families remain unmeasured; no native Word comparison. A font asking for a twilight zone over 1,024 points or a stack over 4,096 values, or a glyph past 256 KiB of hinting buffer, is drawn unhinted; on desktop, once at least three of a face's hinted draws have taken over 50 ms and those slow draws are at least 1/16 of its hinted draws, its later glyphs are drawn unhinted (#3692). | — |
 | Subpoint table grid columns | 🟡 | Preserve positive grid widths rather than imposing a text-box minimum; ECMA-376 §17.4.16. Native Word for Mac 16.113.2 build26092012 confirms narrow trailing grid units. `layout::tests::subpoint_grid_keeps_widths`, `tiny_grid_scales_to_width`. Tiny totals normalize without overflowing the scale factor. Zero and invalid widths retain their fallback. Border painting remains separate. | n/a |
 | Line breaking (UAX #14 with Word's exceptions: no break after `/`, a break after `-` before a digit) | ✅ | `layout::tests::no_line_break_right_after_a_slash`, `layout::tests::a_hyphen_before_digits_is_a_break_opportunity_like_word`, `layout::tests::a_bookmark_is_no_line_break_opportunity; the paragraph's kinsoku (JIS X 4051 §4 行頭禁則) lists the small kana (っゃゕヶ, the katakana phonetic extensions ㇰ…ㇿ, the halfwidth small kana ｧ…ｯ) and the prolonged sound mark ー/ｰ as non-starters — CJ/NS in UAX #14, where the break before them is only a tailoring choice — as JIS X 4051 §4 specifies, inferred from the standard and the synthetic tests named here rather than checked in Word. The rule covers ordinary break opportunities only: a line too narrow for any of them takes the emergency break in `para::break_lines`, which can still start with one, as the module doc records. `layout::tests::a_line_never_starts_with_a_small_kana_or_the_prolonged_sound_mark`, `layout::kinsoku::tests::no_start_holds_every_small_kana_and_the_prolonged_sound_mark` | — |
-| Line breaking (UAX #14 with Word's exceptions: no break after `/`, a break after `-` before a digit, or before a slash and a letter (`Dataprotection-` / `/Secrecyviolation` in the #3408 report's Word PDF; `fitness-/1589` stays whole in the arabic_rice_benefits_article reference)) | ✅ | `layout::tests::no_line_break_right_after_a_slash`, `layout::tests::a_hyphen_before_digits_is_a_break_opportunity_like_word`, `layout::tests::a_hyphen_before_a_slash_is_a_break_opportunity_like_word`, `layout::tests::a_bookmark_is_no_line_break_opportunity` | — |
+| Line breaking (UAX #14 with Word's exceptions: no break after `/`, a break after `-` before a digit, or before a slash and a letter (`Dataprotection-` / `/Secrecyviolation` in the #3408 report's Word PDF; `fitness-/1589` stays whole in the arabic_rice_benefits_article reference), no break between `.` and `(`) | ✅ | `layout::tests::no_line_break_right_after_a_slash`, `layout::tests::a_hyphen_before_digits_is_a_break_opportunity_like_word`, `layout::tests::a_hyphen_before_a_slash_is_a_break_opportunity_like_word`, `layout::tests::a_full_stop_before_a_parenthesis_is_no_break`, `layout::tests::a_bookmark_is_no_line_break_opportunity` | — |
 | A break before a slash that starts a word (" /word" wraps whole; not after a no-break space) | 🟡 | `layout::tests::a_word_after_a_slash_wraps_whole`, `layout::tests::a_no_break_space_before_a_slash_still_holds`; behaviour from the #2963 report, not compared with Word yet | — |
 | Narrow table cells | ✅ | `layout::tests::narrow_cells_keep_their_width`: usable widths below 12 pt wrap without expansion; oversized glyphs still make progress | 0 |
 | Justification, Word 2013+ space shrinking (compat mode 15) | ✅ | #109; spaces before a line's first character (paragraph indented with spaces, after a line break or a tab, a bookmark, hidden text or a floating object's anchor before them) keep their width in justified and distributed lines, `layout::tests::leading_spaces_keep_their_width_in_justified_lines` | — |
@@ -325,6 +325,7 @@ The front-of-text opt-out is retained from the earlier implementation; this patc
 | 2026-11-03 | trivial | A line breaks after a hyphen before a slash and a letter ("Dataprotection-" / "/Secrecyviolation"), not before a slash and a digit ("fitness-/1589" stays whole, as in Word), so auto-fit table columns no longer widen to the whole compound (#3408) |
 | 2026-11-03 | trivial | A section's closing paragraph with a hidden mark and only an in-line picture (or a note reference) is not an empty hidden mark: the picture keeps its room, and a continuous section after it starts below it, not over it; not observed in Word (#5288) |
 | 2026-11-03 | trivial | A row of a nested table marked Can't Split isn't split with its outer row: the outer row moves on whole when that row comes first in it, and otherwise splits above it (inferred); on a fresh page a nested row taller than the room still splits (docxide-pdf `nested-first-row-*-cant1`) |
+| 2026-11-03 | trivial | No line break between a full stop and an opening parenthesis: `2023.(Example` wraps whole at the space before, as in the docxide-pdf `dot-open-token*` Word references |
 | 2026-11-01 | trivial | Columns: the line between them runs from the section's top on the page to the bottom of its tallest column; a continuous section mid-page gets its line (#5178) |
 | 2026-10-31 | trivial | A table row that would leave a cell empty on a page that already holds something (its inline picture or first line runs past the room) moves on whole instead of leaving the other cells' text beside the empty cell; an at-least row grown by its picture no longer splits off the picture (#4272) |
 | 2026-11-01 | trivial | A cell aligned to the middle or bottom of a row split across pages is aligned within the part left on the page when its text fits there, and starts at the top of the cell otherwise, as measured in Word |