diff --git a/framework/UPGRADE.md b/framework/UPGRADE.md
index 9f51979dad..08a976c2d8 100644
--- a/framework/UPGRADE.md
+++ b/framework/UPGRADE.md
@@ -59,6 +59,9 @@ Upgrade from Yii 2.0.11
 * `yii\grid\DataColumn` filter is now automatically generated as dropdown list with localized `Yes` and `No` strings
   in case of `format` being set to `boolean`.
 
+* The signature of `yii\cache\Cache::getOrSet()` has been adjusted to also accept a callable and not only `Closure`.
+  If you extend this method, make sure to adjust your code.
+
 
 Upgrade from Yii 2.0.10
 -----------------------