diff --git a/tfv/tfv_flying.s b/tfv/tfv_flying.s
index b45f1787..7325b592 100644
--- a/tfv/tfv_flying.s
+++ b/tfv/tfv_flying.s
@@ -556,6 +556,7 @@ lookup_map:
 	asl				; multiply by 8
 	clc
 	adc	TEMPY			; add in X value
+					; (use OR instead?)
 
 	ldy	SPACEX_I
 	cpy	#$8
diff --git a/tfv/tfv_multiply.s b/tfv/tfv_multiply.s
index ab6bd80c..a1333002 100644
--- a/tfv/tfv_multiply.s
+++ b/tfv/tfv_multiply.s
@@ -1,6 +1,7 @@
 ; http://www.llx.com/~nparker/a2/mult.html
 ; MULTIPLY NUM1H:NUM1L * NUM2H:NUM2L
-; NUM2 is zero in end
+; NUM2 is zeroed out
+; result is in RESULT3:RESULT2:RESULT1:RESULT0
 
 NUM1L:	.byte 0
 NUM1H:	.byte 0