diff --git a/bin/zulip-send b/bin/zulip-send
index 5d3adbd..d85b47c 100755
--- a/bin/zulip-send
+++ b/bin/zulip-send
@@ -122,7 +122,7 @@ def main(argv=None):
 
     if not do_send_message(client, message_data):
         return 1
-
+    return 0
 
 if __name__ == '__main__':
     sys.exit(main())
diff --git a/integrations/hg/zulip-changegroup.py b/integrations/hg/zulip-changegroup.py
index c0bb9ca..21dc923 100755
--- a/integrations/hg/zulip-changegroup.py
+++ b/integrations/hg/zulip-changegroup.py
@@ -87,7 +87,7 @@ def format_commit_lines(web_url, repo, base, tip):
     return "\n".join(summary for summary in commit_summaries)
 
 def send_zulip(email, api_key, site, stream, subject, content):
-    # type: (str, str, str, str, str, Text) -> str
+    # type: (str, str, str, str, str, Text) -> None
     """
     Send a message to Zulip using the provided credentials, which should be for
     a bot in most cases.