diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 89893579f7a39..a7f16fcd58692 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,9 @@
+*   MemCacheStore: convert any underlying value (including `false`) to an `Entry`.
+
+    See [#42559](https://github.com/rails/rails/pull/42559).
+
+    *Alex Ghiculescu*
+
 *   Fix bug in `number_with_precision` when using large `BigDecimal` values.
 
     Fixes #42302.