diff --git a/lib/linguist/common.yml b/lib/linguist/common.yml
index 8ea75897..e954af51 100644
--- a/lib/linguist/common.yml
+++ b/lib/linguist/common.yml
@@ -1,4 +1,6 @@
 # The languages which will appear on http://github.com/languages
+#
+# This file should only be edited by GitHub staff
 
 - Ada
 - ActionScript
diff --git a/lib/linguist/popular.yml b/lib/linguist/popular.yml
index 2e4277fd..4a2065ee 100644
--- a/lib/linguist/popular.yml
+++ b/lib/linguist/popular.yml
@@ -1,4 +1,6 @@
 # Popular languages appear at the top of language dropdowns
+#
+# This file should only be edited by GitHub staff
 
 - ActionScript
 - Bash