diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ce83d1e..4efefd1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@
 - Fixed /resume showing interrupt messages as session titles
 - Fixed Opus 4.6 launch announcement showing for Bedrock/Vertex/Foundry users
 - Improved error message for many-image dimension limit errors with /compact suggestion
+- Fixed structured-outputs beta header being sent unconditionally on Vertex/Bedrock
 - Improved terminal rendering performance
 - Fixed fatal errors being swallowed instead of displayed
 - Fixed process hanging after session close