diff --git a/reference/spl/splobjectstorage/offsetexists.xml b/reference/spl/splobjectstorage/offsetexists.xml
index 6ec5b7a487..4a7367d17e 100644
--- a/reference/spl/splobjectstorage/offsetexists.xml
+++ b/reference/spl/splobjectstorage/offsetexists.xml
@@ -16,6 +16,11 @@
Checks whether an object exists in the storage.
+
+
+ SplObjectStorage::offsetExists is an alias of SplObjectStorage::contains.
+
+