diff --git a/queries/perga/highlights.scm b/queries/perga/highlights.scm
index dce2dde..2265bf4 100644
--- a/queries/perga/highlights.scm
+++ b/queries/perga/highlights.scm
@@ -1,6 +1,10 @@
 [ "fun" "λ" "forall" "∏" ] @keyword
 (axiom) @keyword
 
+(preprocess
+  (command) @keyword
+  (post_command) @string)
+
 [ "->" "=>" "→" "⇒" "," ":=" ";" ":" ] @punctuation.delimiter
 
 [(star) (square)] @constant.builtin