diff --git a/src/extension.ts b/src/extension.ts
index b334780..f1a94fe 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -22,6 +22,7 @@ const HTML_TYPES = [
   'handlebars',
   'ejs',
   'nunjucks',
+  'haml',
   // for jsx
   ...JS_TYPES
 ]