diff --git a/manpages/shorewall-interfaces.xml b/manpages/shorewall-interfaces.xml
index 4228339bd..5cdca4763 100644
--- a/manpages/shorewall-interfaces.xml
+++ b/manpages/shorewall-interfaces.xml
@@ -79,6 +79,9 @@ loc     eth2            -</programlisting>
           url="shorewall-nesting.html">shorewall-nesting</ulink>(5) for a
           discussion of this problem.</para>
 
+          <para>Beginning with Shorewall 4.2.3, Shorewall-perl allows '+' as
+          an interface name.</para>
+
           <para>There is no need to define the loopback interface (lo) in this
           file.</para>