diff --git a/USER_MANUAL.html b/USER_MANUAL.html
index 4e4c5d64..044f5ff6 100644
--- a/USER_MANUAL.html
+++ b/USER_MANUAL.html
@@ -1292,6 +1292,7 @@ synchronises. (PR #1482)</li>
 <li>Other:
 <ul>
 <li>Waterfall and other plot performance improvements. (PR #1481)</li>
+<li>Windows audio thread timing improvements. (PR #1488)</li>
 </ul></li>
 </ol>
 <h2 data-number="19.2" id="v2.4.0-august-2026"><span
diff --git a/USER_MANUAL.pdf b/USER_MANUAL.pdf
index 8ab36728..cc6489a1 100644
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