diff --git a/src/extension.ts b/src/extension.ts
index c15e6ace0b00fb9e63482329ab9737e9d304a92b..1970008b73bdaf87b095d9d425d9efe87268d5e0 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -26,6 +26,7 @@   'nunjucks',
   'haml',
   'leaf',
   'HTML (Eex)',
+  'slim',
   'edge'
 ]
 const CSS_TYPES = ['css', 'sass', 'scss', 'less', 'stylus']