diff --git a/README b/README
index 2bd4c29..3af8f75 100644
--- a/README
+++ b/README
@@ -40,7 +40,8 @@ Software installation
 1. Install the required packages (gcc-avr, avr-libc, etc.)
   sudo apt-get install arduino-core
 
-2. Get the arduino software version 0018, uncompress it in a directory
+2. Get the arduino software version 0018 (0023 works for RAMPS), uncompress it in a directory
+Arduino software v1 DOES NOT work with Sprinter yet!
    http://www.arduino.cc/en/Main/Software
 
 3. Get the sanguino software, version 0018