2 files changed, 2 insertions, 2 deletions
diff --git a/actionpack/lib/action_dispatch/routing/inspector.rb b/actionpack/lib/action_dispatch/routing/inspector.rb
index 120bc54333..f612e91aef 100644
--- a/actionpack/lib/action_dispatch/routing/inspector.rb
+++ b/actionpack/lib/action_dispatch/routing/inspector.rb
@@ -69,7 +69,7 @@ module ActionDispatch
       end
 
       def internal?
-        controller.to_s =~ %r{\Arails/(info|welcome)} || path =~ %r{\A#{Rails.application.config.assets.prefix}}
+        controller.to_s =~ %r{\Arails/(info|mailers|welcome)} || path =~ %r{\A#{Rails.application.config.assets.prefix}\z}
       end
 
       def engine?
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index b8abdabca5..04faabef37 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -361,7 +361,7 @@ module ActionDispatch
         include UrlFor
       end
 
-      # Contains all the mounted helpers accross different
+      # Contains all the mounted helpers across different
       # engines and the `main_app` helper for the application.
       # You can include this in your classes if you want to
       # access routes for other engines.