--- a/xmpp-headline.sh	Thu Sep 06 14:48:02 2018 +0800
+++ b/xmpp-headline.sh	Thu Sep 06 15:59:23 2018 +0800
@@ -1,4 +1,4 @@
 #!/bin/sh
 
-cat /dev/stdin > /dev/null
+cat /dev/stdin > /dev/null # not needed if stdin is consumed by the script
 path/to/sieve-pipe/venv/bin/python path/to/sieve-pipe/xmpp-headline.py "$@"