diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6987c83348f16bb447c8f6320a8ece85add3acc..0f56561263f375744d8d76a03d1aa9a175b72a62 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,7 @@ API-breaking change is listed.
   + Add new instance `cons_Permutation_inj_l : Inj (=) (≡ₚ) (.:: k).`.
   + Add lemma `Permutation_cross_split`.
   + Make lemma `elem_of_Permutation` a biimplication
+- Add function `kmap` to transform the keys of finite maps.
 
 The following `sed` script should perform most of the renaming
 (on macOS, replace `sed` by `gsed`, installed via e.g. `brew install gnu-sed`):