diff --git a/main.rkt b/main.rkt
index c89fe0b..544e66c 100644
--- a/main.rkt
+++ b/main.rkt
@@ -49,7 +49,8 @@
 ; given a point that is the top-left corner of a square on the grid, returns the amount of edges surrounding that square.
 (define (count-square p g)
   ; explanation:
-  ; for every item in the grid (g), test it against every edge of the box 
+  ; for every item in the grid (g), test it against every edge of the box for equality. these form a list, which is then folded into #t or #f if any match.
+  ; then only those that match are kept and this list is checked for length to determine the matching lines.
   (length
    (filter (lambda (item) (foldl (lambda (x y) (or x y)) #f
          (for/list ([x (list (point 0 0) (point 0 1) (point 1 0) (point 0 0))]