1 files changed, 3 insertions, 0 deletions

diff --git a/quantum/split_common/split_util.h b/quantum/split_common/split_util.h
index d6cf3e72a..45e8db0f2 100644
--- a/quantum/split_common/split_util.h
+++ b/quantum/split_common/split_util.h
@@ -7,6 +7,9 @@
 #include <stdlib.h>
 #include "eeconfig.h"
 
+// backlight level store index in serial_master_buffer[] for slave to read
+#define SERIAL_BACKLIT_START   0x00
+
 #define SLAVE_I2C_ADDRESS           0x32
 
 extern volatile bool isLeftHand;