--- a/hgext3rd/evolve/evolvecmd.py	Wed Jan 23 12:11:36 2019 -0800
+++ b/hgext3rd/evolve/evolvecmd.py	Fri Jan 25 16:51:36 2019 +0530
@@ -1593,6 +1593,7 @@
     _cleanup(ui, repo, startnode, showprogress, shouldupdate)
 
 def solveobswdp(ui, repo, opts):
+    """this function updates to the successor of obsolete wdir parent"""
     oldid = repo['.'].node()
     startctx = repo['.']
     dryrunopt = opts.get('dry_run', False)