From 6205398554d80d117838085f03a218466264862c Mon Sep 17 00:00:00 2001
From: initramfs <initramfs@initramfs.io>
Date: Sat, 24 Sep 2022 11:01:50 +0800
Subject: firewall: T4709: update documentation for TCP MSS clamping

---
 docs/configuration/firewall/index.rst | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

(limited to 'docs/configuration/firewall')

diff --git a/docs/configuration/firewall/index.rst b/docs/configuration/firewall/index.rst
index 8a90e7fa..c2e584a3 100644
--- a/docs/configuration/firewall/index.rst
+++ b/docs/configuration/firewall/index.rst
@@ -812,10 +812,13 @@ IPv4
 
 
 .. cfgcmd:: set firewall options interface <interface> adjust-mss
-   <number-of-bytes>
+   <mss | clamp-mss-to-pmtu>
 
    Use this command to set the maximum segment size for IPv4 transit
-   packets on a specific interface (500-1460 bytes).
+   packets on a specific interface (536-65535 bytes).
+
+   Instead of a numerical MSS value `clamp-mss-to-pmtu` can be used to
+   automatically set the proper value.
 
 Example
 -------
@@ -835,10 +838,13 @@ IPv6
 ====
 
 .. cfgcmd:: set firewall options interface <interface> adjust-mss6
-   <number-of-bytes>
+   <mss | clamp-mss-to-pmtu>
 
    Use this command to set the maximum segment size for IPv6 transit
-   packets on a specific interface (1280-1492 bytes).
+   packets on a specific interface (1220-65535 bytes).
+
+   Instead of a numerical MSS value `clamp-mss-to-pmtu` can be used to
+   automatically set the proper value.
 
 .. _firewall:ipv6_example:
 
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