diff --git a/runtime/plugins/comment/comment.lua b/runtime/plugins/comment/comment.lua
index 6994aa03..b51c9e1c 100644
--- a/runtime/plugins/comment/comment.lua
+++ b/runtime/plugins/comment/comment.lua
@@ -19,6 +19,7 @@ ft["php"] = "// %s"
 ft["rust"] = "// %s"
 ft["shell"] = "# %s"
 ft["lua"] = "-- %s"
+ft["haskell"] = "-- %s"
 ft["javascript"] = "// %s"
 ft["ruby"] = "# %s"
 ft["d"] = "// %s"