diff --git a/appengine/flexible/pubsub/main.py b/appengine/flexible/pubsub/main.py
index 033a345aea8..e97597cb257 100644
--- a/appengine/flexible/pubsub/main.py
+++ b/appengine/flexible/pubsub/main.py
@@ -44,6 +44,8 @@ def index():
 
     data = request.form.get('payload', 'Example payload').encode('utf-8')
 
+    # Consider initialzing the publisher client outside this function
+    # for low latency publish.
     publisher = pubsub_v1.PublisherClient()
     topic_path = publisher.topic_path(
         current_app.config['PROJECT'],