diff --git a/url.html b/url.html
index a11ef61d..6fbc72b5 100644
--- a/url.html
+++ b/url.html
@@ -862,7 +862,7 @@ <h3 id="writing"><span class="secno">5.1 </span>Writing</h3>
 U+00A0 to U+D7FF,
 U+E000 to <!--U+F8FF,
 U+F900 to -->U+FDCF,
-U+FDF0 to U+FFEF,
+U+FDF0 to U+FFFD,<!-- changed relative to IRI from U+FFEF to U+FFFD to align with HTML-->
 U+10000 to U+1FFFD,
 U+20000 to U+2FFFD,
 U+30000 to U+3FFFD,
diff --git a/url.src.html b/url.src.html
index 8998a0eb..6a99e508 100644
--- a/url.src.html
+++ b/url.src.html
@@ -832,7 +832,7 @@ <h3>Writing</h3>
 U+00A0 to U+D7FF,
 U+E000 to <!--U+F8FF,
 U+F900 to -->U+FDCF,
-U+FDF0 to U+FFEF,
+U+FDF0 to U+FFFD,<!-- changed relative to IRI from U+FFEF to U+FFFD to align with HTML-->
 U+10000 to U+1FFFD,
 U+20000 to U+2FFFD,
 U+30000 to U+3FFFD,