diff --git a/CHANGELOG.md b/CHANGELOG.md
index beadd84c7496c9ab623105a76bcc431fed0caeb5..785e0ffe7979db0e37d1d21c92da64a5692a8a05 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ Coq 8.11 is no longer supported.
 - Add `map_Exists` as an analogue to `map_Forall`. (by Michael Sammler)
 - Add `case_match eqn:H` that behaves like `case_match` but allows naming the
   generated equality. (by Michael Sammler)
+- Flip direction of `map_disjoint_fmap`.
 
 The following `sed` script should perform most of the renaming
 (on macOS, replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`).