diff --git a/kernel/core.asm b/kernel/core.asm
index b7a4af9..1545778 100644
--- a/kernel/core.asm
+++ b/kernel/core.asm
@@ -52,7 +52,8 @@ intoIX:
 	pop 	ix
 	ret
 
-; add the value of A into HL, affecting flags like an ordinary addition
+; add the value of A into HL
+; affecting carry flag according to the 16-bit addition, Z, S and P untouched.
 addHL:
 	push	de
 	ld 	d, 0
@@ -62,7 +63,8 @@ addHL:
 	ret
 
 
-; subtract the value of A from HL, affecting flags like an ordinary subtraction
+; subtract the value of A from HL
+; affects flags according to the 16-bit subtraction.
 subHL:
 	push	de
 	ld	d, 0