commit 6e063d914a97c4b8160cb43a3129ea368b2a3fbb
Author: Jamal Hadi Salim <hadi@cyberus.ca>
Date:   Sat Feb 13 11:19:13 2010 -0500

    iputils: ping by mark doc update
    
    Update documentation for ping by-mark
    
    Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>

diff --git a/doc/ping.sgml b/doc/ping.sgml
index 5995ea9..c895d7d 100644
--- a/doc/ping.sgml
+++ b/doc/ping.sgml
@@ -16,6 +16,7 @@
 <command>ping</command>
 <arg choice="opt"><option>-LRUbdfnqrvVaAB</option></arg>
 <arg choice="opt">-c <replaceable/count/</arg>
+<arg choice="opt">-m <replaceable/mark/</arg>
 <arg choice="opt">-i <replaceable/interval/</arg>
 <arg choice="opt">-l <replaceable/preload/</arg>
 <arg choice="opt">-p <replaceable/pattern/</arg>
@@ -76,6 +77,14 @@ The address is bound to one selected when <command/ping/ starts.
   </para></listitem>
  </varlistentry>
  <varlistentry>
+  <term><option>-m <replaceable/mark/</option></term>
+  <listitem><para>
+use <replaceable/mark/ to tag the packets going out. This is useful
+for variety of reasons within the kernel such as using policy
+routing to select specific outbound processing.
+  </para></listitem>
+ </varlistentry>
+ <varlistentry>
   <term><option><anchor id="ping.count">-c <replaceable/count/</option></term>
   <listitem><para>
 Stop after sending <replaceable/count/ ECHO_REQUEST