diff --git a/init.el b/init.el
index 0842014..a608ca7 100644
--- a/init.el
+++ b/init.el
@@ -88,6 +88,7 @@
        yaml      
        (scheme +chez)
        (haskell +lsp)
+       plantuml
 
        :email
        (mu4e +org)