diff --git a/source b/source
index 1b62fe00aab..1f736090c48 100644
--- a/source
+++ b/source
@@ -50222,7 +50222,7 @@ ldh-str       = &lt; as defined in <a href="https://tools.ietf.org/html/rfc1034#
   data-x="concept-fe-values">values</span>, are to be checked.</p>
 
   <p>If specified, the attribute's value must match the JavaScript <i
-  data-x="js-prod-Pattern">Pattern</i><sub><code data-x="">[+U, +N]</code></sub> production.</p>
+  data-x="js-prod-Pattern">Pattern</i><sub><code data-x="">[+UnicodeMode, +N]</code></sub> production.</p>
 
   <div w-nodev>