diff --git a/source b/source
index c88d08510fd..4184ad7a651 100644
--- a/source
+++ b/source
@@ -81913,6 +81913,9 @@ dictionary <dfn dictionary>WindowPostMessageOptions</dfn> : <span>StructuredSeri
    <li><p>If <var>value</var> <span>is</span> "<code data-x="">yes</code>", then return
    true.</p></li>
 
+   <li><p>If <var>value</var> <span>is</span> "<code data-x="">true</code>", then return
+   true.</p></li>
+
    <li><p>Let <var>parsed</var> be the result of <span data-x="rules for parsing integers">parsing
    <var>value</var> as an integer</span>.</p></li>