diff --git a/puppet/zulip/manifests/app_frontend.pp b/puppet/zulip/manifests/app_frontend.pp
index 22a4f1e6ea..ad8b8ad770 100644
--- a/puppet/zulip/manifests/app_frontend.pp
+++ b/puppet/zulip/manifests/app_frontend.pp
@@ -25,7 +25,7 @@ class zulip::app_frontend {
                     # Needed for markdown processing
                     "python-markdown",
                     "python-pygments",
-                    # Not sure why we need this
+                    # Used for Hesiod lookups, etc.
                     "python-dns",
                     # Needed to access our database
                     "postgresql-client-9.1",