diff --git a/book/changelog.md b/book/changelog.md
index 039ed467..66b990d0 100644
--- a/book/changelog.md
+++ b/book/changelog.md
@@ -198,6 +198,9 @@ This will be the first release of Grapevine since it was forked from Conduit
     Consequently fixes Heisenbridge being unable to join puppeted users to its
     rooms ([#85](https://gitlab.computer.surgery/matrix/grapevine/-/issues/85)).
     ([!127](https://gitlab.computer.surgery/matrix/grapevine/-/merge_requests/127))
+20. Fix handling of v11 rooms with `m.room.create` event content that passes
+    the authorization rules but doesn't match other parts of the spec.
+    ([!139](https://gitlab.computer.surgery/matrix/grapevine/-/merge_requests/139))
 
 ### Added