diff --git a/integrations/nagios/nagios-notify-zulip b/integrations/nagios/nagios-notify-zulip
index 6145952..c4d8a37 100755
--- a/integrations/nagios/nagios-notify-zulip
+++ b/integrations/nagios/nagios-notify-zulip
@@ -2,22 +2,25 @@
 import optparse
 import zulip
 
+from typing import List, Text, Dict, Any
+
 VERSION = "0.9"
 # Nagios passes the notification details as command line options.
 # In Nagios, "output" means "first line of output", and "long
 # output" means "other lines of output".
-parser = optparse.OptionParser()
+parser = optparse.OptionParser()  # type: optparse.OptionParser
 parser.add_option('--output',      default='')
 parser.add_option('--long-output', default='')
-parser.add_option('--stream', default='nagios')
-parser.add_option('--config', default='/etc/nagios3/zuliprc')
+parser.add_option('--stream',      default='nagios')
+parser.add_option('--config',      default='/etc/nagios3/zuliprc')
 for opt in ('type', 'host', 'service', 'state'):
     parser.add_option('--' + opt)
-(opts, args) = parser.parse_args()
+(opts, args) = parser.parse_args()  # type: Any, List[Text]
 
-client = zulip.Client(config_file=opts.config, client="ZulipNagios/" + VERSION)
+client = zulip.Client(config_file=opts.config,
+                      client="ZulipNagios/" + VERSION)  # type: zulip.Client
 
-msg = dict(type='stream', to=opts.stream)
+msg = dict(type='stream', to=opts.stream)  # type: Dict[str, Any]
 
 # Set a subject based on the host or service in question.  This enables
 # threaded discussion of multiple concurrent issues, and provides useful
@@ -26,7 +29,7 @@ msg = dict(type='stream', to=opts.stream)
 # We send PROBLEM and RECOVERY messages to the same subject.
 if opts.service is None:
     # Host notification
-    thing = 'host'
+    thing = 'host'  # type: Text
     msg['subject'] = 'host %s' % (opts.host,)
 else:
     # Service notification
@@ -41,7 +44,7 @@ msg['content'] = '**%s**: %s is %s' % (opts.type, thing, opts.state)
 # The "long output" can contain newlines represented by "\n" escape sequences.
 # The Nagios mail command uses /usr/bin/printf "%b" to expand these.
 # We will be more conservative and handle just this one escape sequence.
-output = (opts.output + '\n' + opts.long_output.replace(r'\n', '\n')).strip()
+output = (opts.output + '\n' + opts.long_output.replace(r'\n', '\n')).strip()  # type: Text
 if output:
     # Put any command output in a code block.
     msg['content'] += ('\n\n~~~~\n' + output + "\n~~~~\n")