From dc517079f1bbcf6ddb82f26ac3bfe4c8d23bc588 Mon Sep 17 00:00:00 2001
From: Jean-Marc Molines <jmmolines@gmail.com>
Date: Fri, 21 Jul 2017 15:03:17 +0200
Subject: [PATCH] Update README.md

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index f36b891..efb0523 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,10 @@ in the make.macro file, otherwise set
 
 ```NC4= ```
 
+If you need to use CMIP6 naming convention for input files, you must set the CPP key key_CMIP6 in the `make.macro` file :
+
+```CMIP6 = -Dkey_CMIP6```
+
 Then using `make` (or even `make -j n` if you can compile on n cores), you will have the cdftools programs executable available in the bin/ sub directory. The executable files are ignore by git.