diff --git a/contrib/loaders/flash/nrf5/nrf5.S b/contrib/loaders/flash/nrf5/nrf5.S
index 6f7ed9ae7..53551a2c2 100644
--- a/contrib/loaders/flash/nrf5/nrf5.S
+++ b/contrib/loaders/flash/nrf5/nrf5.S
@@ -35,24 +35,35 @@
 	.global _start
 _start:
 wait_fifo:
+	// Kick the watchdog
 	str	r6, [r7, #0]
+	// Load write pointer
 	ldr	r5, [r1, #0]
+	// Abort if it is NULL
 	cmp	r5, #0
 	beq.n	exit
+	// Load read pointer
 	ldr	r4, [r1, #4]
+	// Continue waiting if it equals the write pointer
 	cmp	r4, r5
 	beq.n	wait_fifo
+	// Copy one word from buffer to target, and increment pointers
 	ldmia	r4!, {r5}
 	stmia	r3!, {r5}
+	// If at end of buffer, wrap back to buffer start
 	cmp	r4, r2
 	bcc.n   no_wrap
 	mov	r4, r1
 	adds	r4, #8
 no_wrap:
+	// Update read pointer inside the buffer
 	str	r4, [r1, #4]
+	// Deduce the word transferred from the byte count
 	subs	r0, #4
+	// Start again
 	bne.n   wait_fifo
 exit:
+	// Wait for OpenOCD
 	bkpt	#0x00
 
 	.pool