diff --git a/macros/code.asm b/macros/code.asm
index 799c27d45..0b36f6c11 100644
--- a/macros/code.asm
+++ b/macros/code.asm
@@ -41,8 +41,8 @@ maskbits: MACRO
 ; example usage in rejection sampling:
 ; .loop
 ; 	call Random
-; 	maskbits 30
-; 	cp 30
+; 	maskbits 26
+; 	cp 26
 ; 	jr nc, .loop
 x = 1
 rept 8
diff --git a/macros/data.asm b/macros/data.asm
index 1543e601d..8adb33005 100644
--- a/macros/data.asm
+++ b/macros/data.asm
@@ -112,10 +112,11 @@ ENDM
 
 
 sine_wave: MACRO
-x = 0.0
+; \1 samples of sin(x) from x=0 to x<32768 (pi radians)
+x = 0
 rept \1
 	dw (sin(x) + (sin(x) & $ff)) >> 8 ; round up
-x = x + 1024.0 ; a circle has 65536.0 "degrees"
+x = x + DIV(32768, \1) ; a circle has 65536 "degrees"
 endr
 ENDM