diff --git a/docs/MultiISP.xml b/docs/MultiISP.xml
index 6af695e01..38bfe1528 100644
--- a/docs/MultiISP.xml
+++ b/docs/MultiISP.xml
@@ -427,6 +427,32 @@
                   </note>
                 </listitem>
               </varlistentry>
+
+              <varlistentry>
+                <term>src=<replaceable>source-address</replaceable> (Added in
+                Shorewall-perl 4.1.5)</term>
+
+                <listitem>
+                  <para> Specifies the source address to use when routing to
+                  this provider and none is known (the local client has bound
+                  to the 0 address). May not be specified when an
+                  <replaceable>address</replaceable> is given in the INTERFACE
+                  column. If this option is not used, Shorewall substitutes
+                  the primary IP address on the interface named in the
+                  INTERFACE column.</para>
+                </listitem>
+              </varlistentry>
+
+              <varlistentry>
+                <term>mtu=<replaceable>number</replaceable> (Added in
+                Shorewall-perl 4.1.5)</term>
+
+                <listitem>
+                  <para>Specifies the MTU when forwarding through this
+                  provider. If not given, the MTU of the interface named in
+                  the INTERFACE column is assumed.</para>
+                </listitem>
+              </varlistentry>
             </variablelist>
 
             <para>For those of you who are termnally confused between<emphasis
diff --git a/manpages/shorewall-providers.xml b/manpages/shorewall-providers.xml
index 5e473790d..4433f8568 100644
--- a/manpages/shorewall-providers.xml
+++ b/manpages/shorewall-providers.xml
@@ -192,6 +192,30 @@
                 provider.</para>
               </listitem>
             </varlistentry>
+
+            <varlistentry>
+              <term>src=<replaceable>source-address</replaceable></term>
+
+              <listitem>
+                <para>Added in Shorewall-perl 4.1.5. Specifies the source
+                address to use when routing to this provider and none is known
+                (the local client has bound to the 0 address). May not be
+                specified when an <replaceable>address</replaceable> is given
+                in the INTERFACE column. If this option is not used, Shorewall
+                substitutes the primary IP address on the interface named in
+                the INTERFACE column.</para>
+              </listitem>
+            </varlistentry>
+
+            <varlistentry>
+              <term>mtu=<replaceable>number</replaceable></term>
+
+              <listitem>
+                <para>Added in Shorewall-perl 4.1.5. Specifies the MTU when
+                forwarding through this provider. If not given, the MTU of the
+                interface named in the INTERFACE column is assumed.</para>
+              </listitem>
+            </varlistentry>
           </variablelist>
         </listitem>
       </varlistentry>