--- a/schema.py	Fri Aug 13 13:34:47 2010 +0200
+++ b/schema.py	Fri Aug 13 08:23:14 2010 +0200
@@ -704,7 +704,7 @@
         """
         if not self.match_condition(session, eidfrom, eidto):
             # XXX at this point if both or neither of S and O are in mainvar we
-            # dunno if the validation error `occured` on eidfrom or eidto (from
+            # dunno if the validation error `occurred` on eidfrom or eidto (from
             # user interface point of view)
             #
             # possible enhancement: check entity being created, it's probably