1 files changed, 12 insertions, 2 deletions
diff --git a/keyboards/4by3/rules.mk b/keyboards/4by3/rules.mk
index 7d2299833..912449366 100644
--- a/keyboards/4by3/rules.mk
+++ b/keyboards/4by3/rules.mk
@@ -1,5 +1,15 @@
-MCU 				= atmega32u4
-BOOTLOADER 			= caterina
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+#   Teensy       halfkay
+#   Pro Micro    caterina
+#   Atmel DFU    atmel-dfu
+#   LUFA DFU     lufa-dfu
+#   QMK DFU      qmk-dfu
+#   ATmega32A    bootloadHID
+#   ATmega328P   USBasp
+BOOTLOADER = caterina
 
 EXTRAKEY_ENABLE 	= yes
 NKRO_ENABLE 		= yes