--- a/hgext3rd/evolve/obshistory.py	Mon Nov 04 14:58:58 2019 -0800
+++ b/hgext3rd/evolve/obshistory.py	Thu Nov 07 10:29:03 2019 +0100
@@ -50,7 +50,7 @@
      (b'p', b'patch', False, _(b'show the patch between two obs versions')),
      (b'f', b'filternonlocal', False, _(b'filter out non local commits')),
      ] + commands.formatteropts,
-    _(b'hg olog [OPTION]... [REV]'),
+    _(b'hg olog [OPTION]... [[-r] REV]...'),
     **compat.helpcategorykwargs('CATEGORY_CHANGE_NAVIGATION'))
 def cmdobshistory(ui, repo, *revs, **opts):
     """show the obsolescence history of the specified revisions