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-rw-r--r--doc/nft.xml16
1 files changed, 16 insertions, 0 deletions
diff --git a/doc/nft.xml b/doc/nft.xml
index d7aae3f0..d3213d02 100644
--- a/doc/nft.xml
+++ b/doc/nft.xml
@@ -4259,6 +4259,22 @@ ip forward ip dscp set 42
</para>
</refsect2>
<refsect2>
+ <title>Extension header statement</title>
+ <para>
+ The extension header statement alters packet content in variable-sized headers.
+ This can currently be used to alter the TCP Maximum segment size of packets,
+ similar to TCPMSS.
+ </para>
+ <para>
+ <example>
+ <title>change tcp mss</title>
+ <programlisting>
+tcp option maxseg size set 1360
+ </programlisting>
+ </example>
+ </para>
+ </refsect2>
+ <refsect2>
<title>Log statement</title>
<para>
<cmdsynopsis>