--- a/Behavior.st	Fri Feb 10 11:24:07 2017 +0100
+++ b/Behavior.st	Fri Feb 10 18:30:50 2017 +0100
@@ -1278,6 +1278,7 @@
 !
 
 lookupMethod:selector
+    <resource: #obsolete>
     "Compatibility method - do not use in new code.
      Return the method for given selector aSelector or nil.
      Only methods in the receiver - not in the superclass chain are returned.