diff --git a/src/mame/video/taito_b.c b/src/mame/video/taito_b.c
index 3db54793b3e..dd932e46bcd 100644
--- a/src/mame/video/taito_b.c
+++ b/src/mame/video/taito_b.c
@@ -212,6 +212,10 @@ static void draw_sprites( running_machine *machine, bitmap_t *bitmap, const rect
 			zoomx = zoomxlatch;
 			zoomy = zoomylatch;
 
+			/* Note: like taito_f2.c, this zoom implementation is wrong,
+			chopped up into 16x16 sections instead of one sprite. This
+			is especially visible in rambo3. */
+
 			x = xlatch + (x_no * (0xff - zoomx) + 15) / 16;
 			y = ylatch + (y_no * (0xff - zoomy) + 15) / 16;
 			zx = xlatch + ((x_no + 1) * (0xff - zoomx) + 15) / 16 - x;