--- a/website/BUGS.html
+++ b/website/BUGS.html
@@ -119,6 +119,14 @@
     fixed by removing (back it up just in case)
     ~/.config/Recoll.org/recoll.conf, the QSettings storage for
     recoll.</li>
+</ul>
+
+<h2><a name="b_1_21_4">recoll 1.21.4</a></h2>
+<ul>
+  <li>The query language parser interprets incorrectly queries having
+    multiple MIME type or category specifications, with missing
+    results as a consequence. This affects all 1.21 versions up to
+    1.21.5 where it is fixed.</li>
 </ul>
 
 <h2><a name="b_1_21_2">recoll 1.21.2</a></h2>