diff --git a/reference/xmlwriter/functions/xmlwriter-open-uri.xml b/reference/xmlwriter/functions/xmlwriter-open-uri.xml
index 5b4253499f..5b7cb02f2c 100644
--- a/reference/xmlwriter/functions/xmlwriter-open-uri.xml
+++ b/reference/xmlwriter/functions/xmlwriter-open-uri.xml
@@ -51,6 +51,16 @@
   </para>
  </refsect1>
 
+ <refsect1 role="notes">
+  &reftitle.notes;
+  <note>
+   <para>
+    On Windows, files opened with this function are locked until the writer is
+    released.
+   </para>
+  </note>
+ </refsect1>
+
  <refsect1 role="seealso">
   &reftitle.seealso;
   <para>