diff --git a/xmodule/util/builtin_assets.py b/xmodule/util/builtin_assets.py
index 488fb67018b..90e99a181e0 100644
--- a/xmodule/util/builtin_assets.py
+++ b/xmodule/util/builtin_assets.py
@@ -14,7 +14,7 @@
 
 def add_css_to_fragment(fragment, css_relative_path):
     """
-    Given a css path relative to xmodule/assets, add a compiled CSS URL to the fragment.
+    Given a css path relative to xmodule/static/css-builtin-blocks, add the CSS URL to the fragment.
 
     Raises:
     * ValueError if {css_relative_path} is absolute or does not end in '.css'.