diff --git a/changelogs/changelog_X_XX_X.md b/changelogs/changelog_X_XX_X.md
index 8b8d5eb916..ece2702ba9 100644
--- a/changelogs/changelog_X_XX_X.md
+++ b/changelogs/changelog_X_XX_X.md
@@ -13,7 +13,7 @@
 
 
 ## Library additions
-
+- `set[T].len` is now an alias for `set[T].card` (cardinality)
 
 ## Library changes