diff --git a/lib/constants.js b/lib/constants.js
index 2d8d0e6..9c5c655 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -903,6 +903,10 @@ export const LANGUAGES = [
     mode: 'powershell',
     highlight: true,
   },
+  {
+    name: 'Protocol Buffer',
+    mode: 'protobuf',
+  },
   {
     name: 'Python',
     mode: 'python',