diff --git a/runtime/help/colors.md b/runtime/help/colors.md
index d4f6c586..9a9de716 100644
--- a/runtime/help/colors.md
+++ b/runtime/help/colors.md
@@ -392,3 +392,6 @@ example, the following is possible for html:
     rules:
         - include: "css"
 ```
+
+Note that nested include (i.e. including syntax files that include other syntax
+files) is not supported yet.