diff --git a/doc/guide/bind10-guide.xml b/doc/guide/bind10-guide.xml
index 64a6040d02..00f7e3aa46 100644
--- a/doc/guide/bind10-guide.xml
+++ b/doc/guide/bind10-guide.xml
@@ -1403,6 +1403,18 @@ AND_MATCH := "ALL": [ RULE_RAW, RULE_RAW, ... ]
           will work in a similar way.
         </para>
 
+        <note>
+          <simpara>
+	    The list form is currently rejected due to an
+	    implementation bug.  There is a plan to fix it relatively
+	    soon, so the syntax is kept here, but note that it won't
+	    work until the bug is fixed.  To keep track of the status
+	    of the issue, see
+	    <ulink url="http://bind10.isc.org/ticket/2191">Trac #2191</ulink>.
+	    Until then, the value must be a single string.
+          </simpara>
+        </note>
+
         <para>
           If that is not enough, you can compose the matching conditions
           to logical expressions. They are called "ANY", "ALL" and "NOT".