diff --git a/rc/filetype/markdown.kak b/rc/filetype/markdown.kak
index 2d7a4d08..f0337ffc 100644
--- a/rc/filetype/markdown.kak
+++ b/rc/filetype/markdown.kak
@@ -42,7 +42,7 @@ add-highlighter shared/markdown/inline/text default-region group
 
 evaluate-commands %sh{
   languages="
-    awk c cabal clojure coffee cpp css cucumber d diff dockerfile fish
+    awk c cabal clojure coffee cpp crystal css cucumber d diff dockerfile fish
     gas go haml haskell html ini java javascript json julia kak kickstart
     latex lisp lua makefile markdown moon objc perl pug python ragel
     ruby rust sass scala scss sh swift toml tupfile typescript yaml sql