diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f2d308c..b02b2374 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,12 @@
 
 ## [Unreleased]
 
+## [v0.51.418] — 2026-06-14 — Release OE (slash-command autocomplete after non-ASCII prefix + multiple slashes, #3924)
+
+### Fixed
+
+- **Slash-command autocomplete now works after a non-ASCII (e.g. CJK) prefix and when the line already contains a slash (#3924).** A new shared helper finds the slash that begins the active command token — only at the start of the line or after whitespace — and is used consistently for detection, parsing, and replacement. Prose containing a mid-word slash (URLs, `provider/model` IDs) no longer opens the command dropdown or blocks sending, `~/` workspace-path autocomplete is no longer shadowed, and `/model openrouter/deepseek`-style commands parse their sub-arguments from the leading command slash instead of a slash inside the argument. (#3924)
+
 ## [v0.51.417] — 2026-06-14 — Release OD (sidebar issue-number + external-refresh fixes, #4154/#3916)
 
 ### Fixed