diff -r 2f54a3e228ff -r c9eb92fb87b7 contrib/showstack.py
--- a/contrib/showstack.py	Mon Jan 15 10:44:49 2018 +0000
+++ b/contrib/showstack.py	Sun Dec 10 21:42:33 2017 +0100
@@ -1,6 +1,8 @@
 # showstack.py - extension to dump a Python stack trace on signal
 #
 # binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
+"""dump stack trace when receiving SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
+"""
 
 from __future__ import absolute_import
 import signal