diff --git a/UPGRADE_TO_2_2 b/UPGRADE_TO_2_2
index 5b01fab04..78e77d315 100644
--- a/UPGRADE_TO_2_2
+++ b/UPGRADE_TO_2_2
@@ -73,4 +73,9 @@ Will now return a collection of arrays with index "user" pointing to the User ob
 
 Thousands of lines were completely reviewed and optimized for best performance.
 Removed redundancy and improved code readability made now internal Doctrine code easier to understand.
-Also, Doctrine 2.2 now is around 10-15% faster than 2.1.
\ No newline at end of file
+Also, Doctrine 2.2 now is around 10-15% faster than 2.1.
+
+# EntityManager#find(null)
+
+Previously EntityManager#find(null) returned null. It now throws an exception.
+