diff --git a/docs/LennyToSqueeze.xml b/docs/LennyToSqueeze.xml
index b27aa7131..33db2da66 100644
--- a/docs/LennyToSqueeze.xml
+++ b/docs/LennyToSqueeze.xml
@@ -922,9 +922,9 @@ insert_rule $filter_table->{OUTPUT},     1, "-p udp --sport 1701 -j ACCEPT";
       <title>Ipsets</title>
 
       <para>Shorewall 4.4 insists that ipset names begin with a letter and be
-      composed of alphanumeric characters and underscores (_). When used in a
-      Shorewall configuration file, the name must be preceded by a plus sign
-      (+) as with the shell-based compiler.</para>
+      composed of alphanumeric characters, underscores (_) and dashes (-).
+      When used in a Shorewall configuration file, the name must be preceded
+      by a plus sign (+) as with the shell-based compiler.</para>
 
       <para>Shorewall 4.4.6 re-introduced SAVE_IPSETS=Yes with slightly
       different semantics:</para>