--- a/plcopen/plcopen.py	Fri Dec 16 22:47:41 2011 +0100
+++ b/plcopen/plcopen.py	Fri Dec 16 22:48:24 2011 +0100
@@ -1006,7 +1006,7 @@
             search_result.extend(_Search([("initial", initial.getvalue())], criteria, parent_infos))
         doc = self.getdocumentation()
         if doc is not None:
-            search_result.extend(doc.Search(criterias, parent_infos + ["documentation"]))
+            search_result.extend(doc.Search(criteria, parent_infos + ["documentation"]))
         return search_result
     setattr(cls, "Search", Search)