diff --git a/CHANGELOG.md b/CHANGELOG.md
index c84a157f13bd6ce5a1d12ed5002c080fef0dc241..2f4c088829901a0173a566376b444eb1c5877d4e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ Coq 8.11 is no longer supported.
   not rely on them.
 - Declare `Hint Mode` for `FinSet A C` so that `C` is input, and `A` is output
   (i.e., inferred from `C`).
+- Add function `map_preimage` to compute the preimage of a finite map.
 
 ## std++ 1.7.0 (2022-01-22)