--- a/ChangeSet.st	Wed Feb 19 20:54:37 2020 +0100
+++ b/ChangeSet.st	Wed Feb 19 20:58:01 2020 +0100
@@ -4894,7 +4894,9 @@
 !ChangeSet::DiffSet methodsFor:'accessing'!
 
 changed
-    "return the set of methods which were different"
+    "return a collection of 2-element vectors containing methods which are different.
+     Each entry consists of a pair, the first element there being the left, the second being the right side method.
+     (left being the receiver changeSet, right the argument changeSet of the diffset-generation operation)"
 
     ^ changed