diff --git a/mandel.s b/mandel.s
index fe29001..d198989 100644
--- a/mandel.s
+++ b/mandel.s
@@ -1148,13 +1148,11 @@ skip_char:
     rts
 
 plus:
-    lda zoom
     cmp #8
     bpl skip_char
     inc zoom
     jmp done
 minus:
-    lda zoom
     cmp #1
     bmi skip_char
     dec zoom
@@ -1211,7 +1209,7 @@ zero_byte_loop:
 
     jsr imul8xe_init
 
-    ; ox = 0; oy = 0
+    ; ox = 0; oy = 0; zoom = 0
     ; count_frames = 0; count_pixels = 0
     lda #0
     sta ox