diff --git a/src/sentry/models/activity.py b/src/sentry/models/activity.py
index fca01faf6e03c..9028e647ad685 100644
--- a/src/sentry/models/activity.py
+++ b/src/sentry/models/activity.py
@@ -121,7 +121,8 @@ def send_notification(self):
 
         author = self.user.first_name or self.user.username
 
-        subject = '%s: %s' % (
+        subject = '[%s] %s: %s' % (
+            self.project.name,
             author,
             self.data['text'].splitlines()[0][:64])