diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 9d575cf3d5..e53ae17c1e 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -5284,6 +5284,7 @@ Propeller Spin:
 Protocol Buffer:
   type: data
   aliases:
+  - proto
   - protobuf
   - Protocol Buffers
   extensions: