--- a/hgext3rd/evolve/obshistory.py	Thu May 18 18:29:28 2017 +0200
+++ b/hgext3rd/evolve/obshistory.py	Thu May 18 18:34:26 2017 +0200
@@ -33,6 +33,9 @@
 def cmdobshistory(ui, repo, *revs, **opts):
     """show the obsolescence history of the specified revisions.
 
+    If no revision range is specified, we display the log for the current
+    working copy parent.
+
     By default this command prints the selected revisions and all its
     precursors. For precursors pointing on existing revisions in the repository,
     it will display revisions node id, revision number and the first line of the