diff --git a/docs/configuration_file_basics.xml b/docs/configuration_file_basics.xml
index 1aa7f5033..e845ad18e 100644
--- a/docs/configuration_file_basics.xml
+++ b/docs/configuration_file_basics.xml
@@ -1631,8 +1631,17 @@ SHELL cat /etc/shorewall/rules.d/*.rules 2&gt; /dev/null || true</programlisting
         <listitem>
           <para>Expands to the name of the current chain. Unlike $0, @0 has
           all non-alphanumeric characters except underscore removed. Also
-          unlike $0, @0 may be used in SWITCH columns in the rules
-          file.</para>
+          unlike $0, @0 may be used in SWITCH columns in configuration
+          files.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term>@1, @2, ... (@{1}, @{2}, ...</term>
+
+        <listitem>
+          <para>These are synonyms for the Action parameter variables $1, $2,
+          etc.</para>
         </listitem>
       </varlistentry>