diff --git a/tests/uart1-loopback.c b/tests/uart1-loopback.c
index 260f19fba..f98fa6dc2 100644
--- a/tests/uart1-loopback.c
+++ b/tests/uart1-loopback.c
@@ -21,8 +21,10 @@ void main(void) {
 	*(volatile uint32_t *)GPIO_FUNC_SEL0 = (0x01 << (14*2)); /* set GPIO14 to UART (UART1 TX)*/
 //	*(volatile uint32_t *)GPIO_FUNC_SEL0 = ( (0x01 << (14*2)) || (0x01 << (15*2)) ); /* set GPIO15-14 to UART (UART1 TX and RX)*/
 
+	/* INC = 76; MOD = 1000 */
 	*(volatile uint32_t *)UART1_BR = 0x004C03E8; /* Baud rate: (INC<<16 || MOD) */ /* is 115200 @ 24 MHz --- unexplained */
 
+
 	*(volatile uint32_t *)UART1_CON = 0x00000003; /* enable receive and transmit */