diff --git a/examples/print-messages b/examples/print-messages
index 8b2186b..ac66dd0 100755
--- a/examples/print-messages
+++ b/examples/print-messages
@@ -45,4 +45,5 @@ client = zulip.init_from_options(options)
 def print_message(message):
     print message
 
+# This is a blocking call, and will continuously poll for new messages
 client.call_on_each_message(print_message)