diff -r 3aa0c203747c -r d06a2feae373 cubicweb/server/hook.py
--- a/cubicweb/server/hook.py	Wed Apr 10 17:59:17 2019 +0000
+++ b/cubicweb/server/hook.py	Thu Apr 18 04:34:34 2019 +0000
@@ -439,7 +439,7 @@
     named parameters `frometypes` and `toetypes` can be used to restrict
     target subject and/or object entity types of the relation.
 
-    :param \*expected: possible relation types
+    :param *expected: possible relation types
     :param frometypes: candidate entity types as subject of relation
     :param toetypes: candidate entity types as object of relation
     """