diff --git a/zephyr/tests.py b/zephyr/tests.py
index 941d6de74f..d977c84300 100644
--- a/zephyr/tests.py
+++ b/zephyr/tests.py
@@ -854,7 +854,8 @@ class SubscriptionAPITest(AuthedTestCase):
         self.assertEqual(msg.sender_id,
                 self.get_user_profile("humbug+notifications@humbughq.com").id)
         expected_msg = ("Hi there!  We thought you'd like to know that %s just "
-                        "subscribed you to the stream '%s'"
+                        "subscribed you to the stream '%s'\nYou can see historical "
+                        "content on a non-invite-only stream by narrowing to it."
                         % (self.user_profile.full_name, streams[0]))
         self.assertEqual(msg.content, expected_msg)
         recipients = get_display_recipient(msg.recipient)
diff --git a/zephyr/views.py b/zephyr/views.py
index 9e69389031..4aca95b86b 100644
--- a/zephyr/views.py
+++ b/zephyr/views.py
@@ -1029,6 +1029,7 @@ def add_subscriptions_backend(request, user_profile,
                     msg += "* %s%s\n" % (
                         stream,
                         " (**invite-only**)" if private_streams[stream] else "")
+            msg += "\nYou can see historical content on a non-invite-only stream by narrowing to it."
             internal_send_message("humbug+notifications@humbughq.com",
                                   "private", email, "", msg)