diff --git a/Sprinter/Configuration.h b/Sprinter/Configuration.h
index 59c332f..b843d65 100644
--- a/Sprinter/Configuration.h
+++ b/Sprinter/Configuration.h
@@ -9,6 +9,8 @@
 // Gen6 = 5, 
 // Sanguinololu up to 1.1 = 6
 // Sanguinololu 1.2 and above = 62
+// Gen 3 Pluss = 21
+// gen 3  Monolithic Electronics = 22
 #define MOTHERBOARD 3 
 
 //// Thermistor settings: