--- a/ChangeSetDiffSet.st	Mon Aug 26 09:19:09 2019 +0200
+++ b/ChangeSetDiffSet.st	Mon Aug 26 09:43:46 2019 +0200
@@ -222,8 +222,11 @@
 !
 
 addAll: aCollection
+    "add aCollection at the end.
+     Returns the argument, aCollection"
 
-    aCollection do:[:e|self add:e]
+    aCollection do:[:e| self add:e].
+    ^ aCollection
 
     "Created: / 10-11-2009 / 11:27:43 / Jan Vrany <jan.vrany@fit.cvut.cz>"
 ! !