From 2b27878fb9da51fe5d88138af151c99b3f611d18 Mon Sep 17 00:00:00 2001
From: Beth Wright <zbwright@gmail.com>
Date: Fri, 5 May 2017 15:11:37 -0700
Subject: [PATCH] docs: adding MTU note.

---
 Documentation/configuration.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/configuration.md b/Documentation/configuration.md
index 2c81634d42..9c59640ecb 100644
--- a/Documentation/configuration.md
+++ b/Documentation/configuration.md
@@ -61,6 +61,8 @@ The following configuration illustrates the use of most options with `udp` backe
 --version: print version and exit
 ```
 
+MTU is calculated and set automatically by flannel. It then reports that value in `subnet.env`. This value cannot be changed.
+
 ## Environment variables
 
 The command line options outlined above can also be specified via environment variables.