diff --git a/README b/README
index 17f9705..738efbb 100644
--- a/README
+++ b/README
@@ -1 +1,3 @@
-This repository contains less configuration file which I use on my system.
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+This repository contains less configuration file which I use on my system.
+
+Remember to set the environment variable "LESSKEY_SYSTEM" (see less manual for more informations).
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