diff --git a/day05-hard/main.scm b/day05-hard/main.scm
index 1e70e1a..9a60576 100755
--- a/day05-hard/main.scm
+++ b/day05-hard/main.scm
@@ -224,7 +224,7 @@
   #f
   (min-list '()))
 
-;=============== repeat ======================
+;=============== remove-adjacent-duplicates ======================
 (define remove-adjacent-duplicates
   (reduce-right '()
     (lambda (current accumulator)
@@ -274,7 +274,7 @@
   ((split (is 0))
     '(0 1 2 0 0 3 4 5 0 6 7 0)))
 
-;=============== split ======================
+;=============== chunks ======================
 (define (chunks chunk-size)
   (compose (list
     cdr
@@ -374,7 +374,7 @@
     (list symbol-in-both-ranges 20 30))
   (get-range-intersections 20 30 20 30))
 
-;=============== solution ======================
+;=============== solution data definitions ======================
 (define symbol-current (quote current))
 (define symbol-previous (quote previous))
 
@@ -408,6 +408,7 @@
 (define (get-map-source-end seed-map) (value-by-index seed-map 1))
 (define (get-map-destination-start seed-map) (value-by-index seed-map 2))
 
+;=============== solution ======================
 (define (apply-map-to-range map-source-start map-source-end map-destination-start range-start range-end)
   ((compose (list
     (map (lambda (intersection)