diff --git a/queries/kconfig/highlights.scm b/queries/kconfig/highlights.scm
index bad7a26eb..307ce1a13 100644
--- a/queries/kconfig/highlights.scm
+++ b/queries/kconfig/highlights.scm
@@ -42,6 +42,8 @@
   ">="
   "!"
   ":="
+  "+="
+  "?="
 ] @operator
 
 [