diff --git a/samples/snippets/iam.py b/samples/snippets/iam.py
index b46bc1147..bd44f1ab6 100644
--- a/samples/snippets/iam.py
+++ b/samples/snippets/iam.py
@@ -28,6 +28,7 @@
 
 def get_topic_policy(project, topic_name):
     """Prints the IAM policy for the given topic."""
+    # [START pubsub_get_topic_policy]
     client = pubsub_v1.PublisherClient()
     topic_path = client.topic_path(project, topic_name)
 
@@ -36,10 +37,12 @@ def get_topic_policy(project, topic_name):
     print('Policy for topic {}:'.format(topic_path))
     for binding in policy.bindings:
         print('Role: {}, Members: {}'.format(binding.role, binding.members))
+    # [END pubsub_get_topic_policy]
 
 
 def get_subscription_policy(project, subscription_name):
     """Prints the IAM policy for the given subscription."""
+    # [START pubsub_get_subscription_policy]
     client = pubsub_v1.SubscriberClient()
     subscription_path = client.subscription_path(project, subscription_name)
 
@@ -48,10 +51,12 @@ def get_subscription_policy(project, subscription_name):
     print('Policy for subscription {}:'.format(subscription_path))
     for binding in policy.bindings:
         print('Role: {}, Members: {}'.format(binding.role, binding.members))
+    # [END pubsub_get_subscription_policy]
 
 
 def set_topic_policy(project, topic_name):
     """Sets the IAM policy for a topic."""
+    # [START pubsub_set_topic_policy]
     client = pubsub_v1.PublisherClient()
     topic_path = client.topic_path(project, topic_name)
 
@@ -72,10 +77,12 @@ def set_topic_policy(project, topic_name):
 
     print('IAM policy for topic {} set: {}'.format(
         topic_name, policy))
+    # [END pubsub_set_topic_policy]
 
 
 def set_subscription_policy(project, subscription_name):
     """Sets the IAM policy for a topic."""
+    # [START pubsub_set_subscription_policy]
     client = pubsub_v1.SubscriberClient()
     subscription_path = client.subscription_path(project, subscription_name)
 
@@ -96,10 +103,12 @@ def set_subscription_policy(project, subscription_name):
 
     print('IAM policy for subscription {} set: {}'.format(
         subscription_name, policy))
+    # [END pubsub_set_subscription_policy]
 
 
 def check_topic_permissions(project, topic_name):
     """Checks to which permissions are available on the given topic."""
+    # [START pubsub_test_topic_permissions]
     client = pubsub_v1.PublisherClient()
     topic_path = client.topic_path(project, topic_name)
 
@@ -113,10 +122,12 @@ def check_topic_permissions(project, topic_name):
 
     print('Allowed permissions for topic {}: {}'.format(
         topic_path, allowed_permissions))
+    # [END pubsub_test_topic_permissions]
 
 
 def check_subscription_permissions(project, subscription_name):
     """Checks to which permissions are available on the given subscription."""
+    # [START pubsub_test_subscription_permissions]
     client = pubsub_v1.SubscriberClient()
     subscription_path = client.subscription_path(project, subscription_name)
 
@@ -130,6 +141,7 @@ def check_subscription_permissions(project, subscription_name):
 
     print('Allowed permissions for subscription {}: {}'.format(
         subscription_path, allowed_permissions))
+    # [END pubsub_test_subscription_permissions]
 
 
 if __name__ == '__main__':
diff --git a/samples/snippets/publisher.py b/samples/snippets/publisher.py
index 76d058993..f2f5e3ac6 100644
--- a/samples/snippets/publisher.py
+++ b/samples/snippets/publisher.py
@@ -28,35 +28,42 @@
 
 def list_topics(project):
     """Lists all Pub/Sub topics in the given project."""
+    # [START pubsub_list_topics]
     publisher = pubsub_v1.PublisherClient()
     project_path = publisher.project_path(project)
 
     for topic in publisher.list_topics(project_path):
         print(topic)
+    # [END pubsub_list_topics]
 
 
 def create_topic(project, topic_name):
     """Create a new Pub/Sub topic."""
+    # [START pubsub_create_topic]
     publisher = pubsub_v1.PublisherClient()
     topic_path = publisher.topic_path(project, topic_name)
 
     topic = publisher.create_topic(topic_path)
 
     print('Topic created: {}'.format(topic))
+    # [END pubsub_create_topic]
 
 
 def delete_topic(project, topic_name):
     """Deletes an existing Pub/Sub topic."""
+    # [START pubsub_delete_topic]
     publisher = pubsub_v1.PublisherClient()
     topic_path = publisher.topic_path(project, topic_name)
 
     publisher.delete_topic(topic_path)
 
     print('Topic deleted: {}'.format(topic_path))
+    # [END pubsub_delete_topic]
 
 
 def publish_messages(project, topic_name):
     """Publishes multiple messages to a Pub/Sub topic."""
+    # [START pubsub_quickstart_publisher]
     publisher = pubsub_v1.PublisherClient()
     topic_path = publisher.topic_path(project, topic_name)
 
@@ -67,11 +74,13 @@ def publish_messages(project, topic_name):
         publisher.publish(topic_path, data=data)
 
     print('Published messages.')
+    # [END pubsub_quickstart_publisher]
 
 
 def publish_messages_with_custom_attributes(project, topic_name):
     """Publishes multiple messages with custom attributes
     to a Pub/Sub topic."""
+    # [START pubsub_publish_custom_attributes]
     publisher = pubsub_v1.PublisherClient()
     topic_path = publisher.topic_path(project, topic_name)
 
@@ -84,11 +93,13 @@ def publish_messages_with_custom_attributes(project, topic_name):
             topic_path, data, origin='python-sample', username='gcp')
 
     print('Published messages with custom attributes.')
+    # [END pubsub_publish_custom_attributes]
 
 
 def publish_messages_with_futures(project, topic_name):
     """Publishes multiple messages to a Pub/Sub topic and prints their
     message IDs."""
+    # [START pubsub_publisher_concurrency_control]
     publisher = pubsub_v1.PublisherClient()
     topic_path = publisher.topic_path(project, topic_name)
 
@@ -107,10 +118,12 @@ def publish_messages_with_futures(project, topic_name):
     for future in futures:
         # result() blocks until the message is published.
         print(future.result())
+    # [END pubsub_publisher_concurrency_control]
 
 
 def publish_messages_with_batch_settings(project, topic_name):
     """Publishes multiple messages to a Pub/Sub topic with batch settings."""
+    # [START pubsub_publisher_batch_settings]
     # Configure the batch to publish once there is one kilobyte of data or
     # 1 second has passed.
     batch_settings = pubsub_v1.types.BatchSettings(
@@ -127,6 +140,7 @@ def publish_messages_with_batch_settings(project, topic_name):
         publisher.publish(topic_path, data=data)
 
     print('Published messages.')
+    # [END pubsub_publisher_batch_settings]
 
 
 if __name__ == '__main__':
diff --git a/samples/snippets/quickstart.py b/samples/snippets/quickstart.py
index c9823d789..1ff2efed3 100644
--- a/samples/snippets/quickstart.py
+++ b/samples/snippets/quickstart.py
@@ -16,7 +16,7 @@
 
 
 def run_quickstart():
-    # [START pubsub_quickstart]
+    # [START pubsub_quickstart_create_topic]
     # Imports the Google Cloud client library
     from google.cloud import pubsub_v1
 
@@ -32,7 +32,7 @@ def run_quickstart():
     topic = publisher.create_topic(topic_path)
 
     print('Topic created: {}'.format(topic))
-    # [END pubsub_quickstart]
+    # [END pubsub_quickstart_create_topic]
 
 
 if __name__ == '__main__':
diff --git a/samples/snippets/subscriber.py b/samples/snippets/subscriber.py
index f68c06c95..34f2301d8 100644
--- a/samples/snippets/subscriber.py
+++ b/samples/snippets/subscriber.py
@@ -29,24 +29,29 @@
 
 def list_subscriptions_in_topic(project, topic_name):
     """Lists all subscriptions for a given topic."""
+    # [START pubsub_list_topic_subscriptions]
     subscriber = pubsub_v1.PublisherClient()
     topic_path = subscriber.topic_path(project, topic_name)
 
     for subscription in subscriber.list_topic_subscriptions(topic_path):
         print(subscription)
+    # [END pubsub_list_topic_subscriptions]
 
 
 def list_subscriptions_in_project(project):
     """Lists all subscriptions in the current project."""
+    # [START pubsub_list_subscriptions]
     subscriber = pubsub_v1.SubscriberClient()
     project_path = subscriber.project_path(project)
 
     for subscription in subscriber.list_subscriptions(project_path):
         print(subscription.name)
+    # [END pubsub_list_subscriptions]
 
 
 def create_subscription(project, topic_name, subscription_name):
     """Create a new pull subscription on the given topic."""
+    # [START pubsub_create_pull_subscription]
     subscriber = pubsub_v1.SubscriberClient()
     topic_path = subscriber.topic_path(project, topic_name)
     subscription_path = subscriber.subscription_path(
@@ -56,16 +61,16 @@ def create_subscription(project, topic_name, subscription_name):
         subscription_path, topic_path)
 
     print('Subscription created: {}'.format(subscription))
+    # [END pubsub_create_pull_subscription]
 
 
 def create_push_subscription(project,
                              topic_name,
                              subscription_name,
                              endpoint):
-    """Create a new push subscription on the given topic.
-    For example, endpoint is
-    "https://my-test-project.appspot.com/push".
-    """
+    """Create a new push subscription on the given topic."""
+    # [START pubsub_create_push_subscription]
+    # endpoint = "https://my-test-project.appspot.com/push"
     subscriber = pubsub_v1.SubscriberClient()
     topic_path = subscriber.topic_path(project, topic_name)
     subscription_path = subscriber.subscription_path(
@@ -79,10 +84,12 @@ def create_push_subscription(project,
 
     print('Push subscription created: {}'.format(subscription))
     print('Endpoint for subscription is: {}'.format(endpoint))
+    # [END pubsub_create_push_subscription]
 
 
 def delete_subscription(project, subscription_name):
     """Deletes an existing Pub/Sub topic."""
+    # [START pubsub_delete_subscription]
     subscriber = pubsub_v1.SubscriberClient()
     subscription_path = subscriber.subscription_path(
         project, subscription_name)
@@ -90,15 +97,17 @@ def delete_subscription(project, subscription_name):
     subscriber.delete_subscription(subscription_path)
 
     print('Subscription deleted: {}'.format(subscription_path))
+    # [END pubsub_delete_subscription]
 
 
 def update_subscription(project, subscription_name, endpoint):
     """
     Updates an existing Pub/Sub subscription's push endpoint URL.
     Note that certain properties of a subscription, such as
-    its topic, are not modifiable. For example, endpoint is
-    "https://my-test-project.appspot.com/push".
+    its topic, are not modifiable.
     """
+    # [START pubsub_update_push_configuration]
+    # endpoint = "https://my-test-project.appspot.com/push"
     subscriber = pubsub_v1.SubscriberClient()
     subscription_path = subscriber.subscription_path(
         project, subscription_name)
@@ -122,10 +131,13 @@ def update_subscription(project, subscription_name, endpoint):
     print('Subscription updated: {}'.format(subscription_path))
     print('New endpoint for subscription is: {}'.format(
         result.push_config))
+    # [END pubsub_update_push_configuration]
 
 
 def receive_messages(project, subscription_name):
     """Receives messages from a pull subscription."""
+    # [START pubsub_subscriber_async_pull]
+    # [START pubsub_quickstart_subscriber]
     subscriber = pubsub_v1.SubscriberClient()
     subscription_path = subscriber.subscription_path(
         project, subscription_name)
@@ -141,10 +153,13 @@ def callback(message):
     print('Listening for messages on {}'.format(subscription_path))
     while True:
         time.sleep(60)
+    # [END pubsub_subscriber_async_pull]
+    # [END pubsub_quickstart_subscriber]
 
 
 def receive_messages_with_custom_attributes(project, subscription_name):
     """Receives messages from a pull subscription."""
+    # [START pubsub_subscriber_sync_pull_custom_attributes]
     subscriber = pubsub_v1.SubscriberClient()
     subscription_path = subscriber.subscription_path(
         project, subscription_name)
@@ -165,10 +180,12 @@ def callback(message):
     print('Listening for messages on {}'.format(subscription_path))
     while True:
         time.sleep(60)
+    # [END pubsub_subscriber_sync_pull_custom_attributes]
 
 
 def receive_messages_with_flow_control(project, subscription_name):
     """Receives messages from a pull subscription with flow control."""
+    # [START pubsub_subscriber_flow_settings]
     subscriber = pubsub_v1.SubscriberClient()
     subscription_path = subscriber.subscription_path(
         project, subscription_name)
@@ -187,10 +204,12 @@ def callback(message):
     print('Listening for messages on {}'.format(subscription_path))
     while True:
         time.sleep(60)
+    # [END pubsub_subscriber_flow_settings]
 
 
 def listen_for_errors(project, subscription_name):
     """Receives messages and catches errors from a pull subscription."""
+    # [START pubsub_subscriber_error_listener]
     subscriber = pubsub_v1.SubscriberClient()
     subscription_path = subscriber.subscription_path(
         project, subscription_name)
@@ -210,6 +229,7 @@ def callback(message):
             'Listening for messages on {} threw an Exception: {}.'.format(
                 subscription_name, e))
         raise
+    # [END pubsub_subscriber_error_listener]
 
 
 if __name__ == '__main__':