diff --git a/rc/tools/comment.kak b/rc/tools/comment.kak
index 449bbc06..3787550c 100644
--- a/rc/tools/comment.kak
+++ b/rc/tools/comment.kak
@@ -15,7 +15,7 @@ hook global BufSetOption filetype=asciidoc %{
     set-option buffer comment_block_end '////'
 }
 
-hook global BufSetOption filetype=(c|cpp|dart|gluon|go|java|javascript|objc|php|rust|sass|scala|scss|swift|typescript) %{
+hook global BufSetOption filetype=(c|cpp|dart|gluon|go|java|javascript|objc|php|protobuf|rust|sass|scala|scss|swift|typescript) %{
     set-option buffer comment_line '//'
     set-option buffer comment_block_begin '/*'
     set-option buffer comment_block_end '*/'