diff --git a/changelog.md b/changelog.md
index 9a7f28c6d97ac689d351d5ffd165f417737e273a..9e83fee1d15ddc5fdea2df520571250fad1781c9 100644
--- a/changelog.md
+++ b/changelog.md
@@ -16,6 +16,8 @@
 
   * Derive `Generic` and `Generic1` for `Data.Tree`.
 
+  * Add `foldTree` for `Data.Tree`.
+
   * Slightly optimize `replicateA` and `traverse` for `Data.Sequence`.
 
   * Speed up `adjust` for `Data.Map`.