diff --git a/c64/kernal/ea81.s b/c64/kernal/ea81.s
index 431b65f0..077d2845 100644
--- a/c64/kernal/ea81.s
+++ b/c64/kernal/ea81.s
@@ -8,6 +8,7 @@
 
 return_from_interrupt:
 	;; Restore registers and return
+	;; Sequence according to Compute's Mapping the 64 p73
 	pla
 	tay
 	pla
diff --git a/c64/kernal/irq_handler.s b/c64/kernal/irq_handler.s
index f090b05a..7340963b 100644
--- a/c64/kernal/irq_handler.s
+++ b/c64/kernal/irq_handler.s
@@ -8,6 +8,7 @@ irq_handler:
 	;; Also the $0314 vector is widely used (e.g., https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb)
 	
 	;; Save registers
+	;; Sequence according to Compute's Mapping the 64 p73
 	pha
 	txa
 	pha