appengine_flexible/pubsub: clarify purpose of verification token
@@ -7,5 +7,7 @@ automatic_scaling:
#[START gae_flex_pubsub_yaml]
env_variables:
PUBSUB_TOPIC: your-topic
+ # This token is used to verify that requests originate from your
+ # application. It can be any sufficiently random string.
PUBSUB_VERIFICATION_TOKEN: your-token
#[END gae_flex_pubsub_yaml]
