diff --git a/AGENTS.md b/AGENTS.md
index 7c9c78f..f22a691 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -5,6 +5,9 @@ Read `.agents/rules/README.md` before changing this repository.
 Read `.agents/docs/README.md` for the current portal, source ownership, and
 maintenance entry points.
 
+Read the organization [CSS ownership and maintenance rule](https://github.com/cordisx/cordisxmono/blob/main/.agents/rules/css.md)
+before changing CSS, stylesheet-generating code, or a style-bearing DOM contract.
+
 - Do not author CordisX product or protocol documentation here.
 - Change source material in its owning repository.
 - Keep only aggregation, navigation, presentation, and publication configuration here.