diff --git a/README.md b/README.md
index dd8e183d7c896cb10c35adca56c449c40e129f9b..192716469af539dc6a5bf9f70e631e5ccceae466 100644
--- a/README.md
+++ b/README.md
@@ -10,3 +10,11 @@ Study the firmware | https://duet3d.dozuki.com/c/RepRapFirmware
 Understand the G-Code | https://duet3d.dozuki.com/Wiki/Gcode
 
 Update to the latest release | https://github.com/dc42/RepRapFirmware/releases
+
+**If you are using the RRF2 please use the files contained in the rrf2.x directory.**
+
+**If you are using the RRF3 please use the files contained in the rrf3.x directory.**
+
+**If you are not using the correct configuration files the machine will not operate correctly.**
+
+**If you do not know which version you have, type M115 into the console.**