diff --git a/doc/api/hooks_client-side.md b/doc/api/hooks_client-side.md
index 367e0688..1c9ca5af 100644
--- a/doc/api/hooks_client-side.md
+++ b/doc/api/hooks_client-side.md
@@ -111,7 +111,7 @@ Called from: src/static/js/ace.js
 
 Things in context: None
 
-This hook is provided to allow custom CSS files to be loaded. The return value should be an array of paths relative to the plugins directory.
+This hook is provided to allow custom CSS files to be loaded. The return value should be an array of resource urls or paths relative to the plugins directory.
 
 ## aceInitInnerdocbodyHead
 Called from: src/static/js/ace.js