diff --git a/insertion-sort.py b/insertion-sort.py
index 628fc83..8abce8c 100644
--- a/insertion-sort.py
+++ b/insertion-sort.py
@@ -1,8 +1,12 @@
-array = [24, 10, 40, 28, 31, 9, 29, 42, 39, 19, 18, 37, 11, 14, 49, 47, 22, 16, 38, 6, 4, 27, 21, 48, 35, 23, 17, 1, 44, 25, 41, 2, 46, 30, 8, 50, 32, 5, 20, 33, 34, 26, 36, 12, 43, 15, 45, 7, 3, 13]
-print("Original array:", array)
-for i in range(0, len(array)):
+# selective sort algorithm
+
+# list to be sorted
+original = [24, 10, 40, 28, 31, 9, 29, 42, 39, 19, 18, 37, 11, 14, 49, 47, 22, 16, 38, 6, 4, 27, 21, 48, 35, 23, 17, 1, 44, 25, 41, 2, 46, 30, 8, 50, 32, 5, 20, 33, 34, 26, 36, 12, 43, 15, 45, 7, 3, 13]
+print("Original list:", original)
+
+for i in range(0, len(original)):
     j = 0
-    while array[i] > array[j]:
+    while original[i] > original[j]:
         j += 1
-    array.insert(j, array.pop(i))
-print("New array:", array)
\ No newline at end of file
+    original.insert(j, original.pop(i))
+print("New list:", original)
\ No newline at end of file
diff --git a/selective-sort.py b/selective-sort.py
index 54f9e14..116d705 100644
--- a/selective-sort.py
+++ b/selective-sort.py
@@ -1,12 +1,16 @@
+# selective sort algorithm
+
+# list to be sorted
 original = [24, 10, 40, 28, 31, 9, 29, 42, 39, 19, 18, 37, 11, 14, 49, 47, 22, 16, 38, 6, 4, 27, 21, 48, 35, 23, 17, 1, 44, 25, 41, 2, 46, 30, 8, 50, 32, 5, 20, 33, 34, 26, 36, 12, 43, 15, 45, 7, 3, 13]
 new = []
 print("Original list:", original)
+# sort through the list, finding the smallest number each time
 for x in range(0, len(original)):
     for i, item in enumerate(original):
         if i == 0:
             lowest = 0
         elif original[i] < original[lowest]:
             lowest = i
-    new.append(original[lowest])
-    original.pop(lowest)
+    # remove the smallest number from the original list & add it to the new list
+    new.append(original.pop(lowest))
 print("New list:", new)
\ No newline at end of file
diff --git a/sorting-visualisations.py b/sorting-visualisations.py
index fb8d639..74c3857 100644
--- a/sorting-visualisations.py
+++ b/sorting-visualisations.py
@@ -2,23 +2,28 @@ import pygame, time
 
 finished = False
 
+# define function for updating the display contents
 def updateDisplay():
+    # show the reset button if the sorting has completed
     if finished:
         gameDisplay.blit(buttonReset, buttonResetRect)
+    # if the sorting hasn't completed
     else:
-        # Set the background colour
+        # wipe the screen
         gameDisplay.fill(black)
 
+        # if the sorting algorithm to be used has been been defined as 1, 2 or 3
         if sortingAlgorithm != 0:
+            # draw one rect object for each item in the list
             for loop in range(0,len(numberList)):
-                # Place other objects to display below
-                pygame.draw.rect(gameDisplay, colourList[numberList[loop]-1], [loop*20, 90, 20, 20])  # rect in [] list   x,y,w,h  0,0 is top left
-            # display current time taken
+                pygame.draw.rect(gameDisplay, colourList[numberList[loop]-1], [loop*20, 90, 20, 20])
+            # display current time taken in top left
             timeText = font.render("{:.1f} seconds".format(time.time() - startTime), True, white)
             timeTextRect = timeText.get_rect()
             timeTextRect.top = 10
             timeTextRect.left = 10
             gameDisplay.blit(timeText, timeTextRect)
+        # if the sorting algorithm hasn't yet been chosen, show the buttons for doing so
         else:
             gameDisplay.blit(buttonSelective, buttonSelectiveRect)
             gameDisplay.blit(buttonInsertion, buttonInsertionRect)
@@ -26,11 +31,14 @@ def updateDisplay():
 
     # redisplay window
     pygame.display.update()
+    
+    # adjust for desired framerate
     clock.tick(fps)
 
+# define function for checking whether the user wants to exit the program
 def checkQuit():
     for event in pygame.event.get():
-        # allow safe exit
+        # allow exit using window exit button (the red cross)
         if event.type == pygame.QUIT:
             pygame.quit()
             quit()
@@ -41,23 +49,27 @@ def checkQuit():
                 pygame.quit()
                 quit()
 
+# define function for checking if any start buttons have been pressed
 def checkStartButtons():
     for event in pygame.event.get():
         if event.type == pygame.MOUSEBUTTONDOWN:
-            # checks if mouse position is over any start buttons
+            # checks if mouse position is over selective sort button
             if buttonSelectiveRect.collidepoint(event.pos):
                 # prints current location of mouse
                 print('Selective button was pressed at {0}'.format(event.pos))
                 return 1
+            # checks if mouse position is over insertion sort button
             elif buttonInsertionRect.collidepoint(event.pos):
                 # prints current location of mouse
                 print('Insertion button was pressed at {0}'.format(event.pos))
                 return 2
+            # checks if mouse position is over bubble sort button
             elif buttonBubbleRect.collidepoint(event.pos):
                 # prints current location of mouse
                 print('Bubble button was pressed at {0}'.format(event.pos))
                 return 3
 
+# define function for checking if the reset button has been pressed
 def checkResetButton():
     for event in pygame.event.get():
         if event.type == pygame.MOUSEBUTTONDOWN:
@@ -65,20 +77,19 @@ def checkResetButton():
             if buttonResetRect.collidepoint(event.pos):
                 # prints current location of mouse
                 print('Reset button was pressed at {0}'.format(event.pos))
+                # returns value for use in the variable finished
                 return False
+    # returns value for use in the variable finished
     return True
 
-def resetGame():
-    numberList = originalNumberList
-
 # initialise PyGame
 pygame.init()
 
+# define font for usage with text
 font = pygame.font.Font("Roboto-Regular.ttf", 32)
+# define some basic colours, for easier referencing later on
 black = (0, 0, 0)
 white = (255, 255, 255)
-green = (0, 255, 0)
-blue = (0, 0, 128)
 
 # define clock, to allow framerate alteration
 clock = pygame.time.Clock()
@@ -86,15 +97,16 @@ clock = pygame.time.Clock()
 # list of colours, in colour order
 colourList = [(239, 69, 69), (239, 86, 69), (239, 103, 69), (239, 120, 69), (239, 137, 69), (239, 154, 69), (239, 171, 69), (239, 188, 69), (239, 205, 69), (239, 222, 69), (239, 239, 69), (222, 239, 69), (205, 239, 69), (188, 239, 69), (171, 239, 69), (154, 239, 69), (137, 239, 69), (120, 239, 69), (103, 239, 69), (86, 239, 69), (69, 239, 69), (69, 239, 86), (69, 239, 103), (69, 239, 120), (69, 239, 137), (69, 239, 154), (69, 239, 171), (69, 239, 188), (69, 239, 205), (69, 239, 222), (69, 239, 239), (69, 222, 239), (69, 205, 239), (69, 188, 239), (69, 171, 239), (69, 154, 239), (69, 137, 239), (69, 120, 239), (69, 103, 239), (69, 86, 239), (69, 69, 239), (86, 69, 239), (103, 69, 239), (120, 69, 239), (137, 69, 239), (154, 69, 239), (171, 69, 239), (188, 69, 239), (205, 69, 239), (222, 69, 239), (239, 69, 239), (239, 69, 222), (239, 69, 205), (239, 69, 188), (239, 69, 171), (239, 69, 154), (239, 69, 137), (239, 69, 120), (239, 69, 103), (239, 69, 86)]
 # list of numbers to be sorted
+# two lists are used so that the original one is retained whilst the other is altered, allowing resetting at the end of the program
 originalNumberList = [30,4,5,6,36,38,37,32,17,19,8,10,56,50,20,13,14,40,58,21,43,51,1,31,41,16,60,22,34,28,9,12,42,2,27,18,26,47,39,24,57,23,46,53,15,25,7,33,49,59,35,44,45,11,54,29,55,52,3,48]
 numberList = originalNumberList.copy()
 
 # frame rate of sorting visualisation
 fps = 25
 
+# define which sorting algorithm to use (1, 2 and 3 are the only valid options, for selective, insertion and bubble, respectively)
 sortingAlgorithm = 0
 
-
 # define height and width of display
 display_width = len(numberList)*20
 display_height = 200
@@ -124,65 +136,97 @@ buttonReset = font.render("Reset", True, white)
 buttonResetRect = buttonBubble.get_rect()
 buttonResetRect.center = (display_width / 2, display_height / 2 + 60)
 
+# update display contents
 updateDisplay()
 
+# run until manual exit
 while True:
+    # selection sort
     if sortingAlgorithm == 1:
+        # set start time, for use with on-screen timer
         startTime = time.time()
-        # selection sort
         swapPosition = 0
         swapData = 0
+        # find the smallest number in the list until it is fully sorted
         for i in range(0, len(numberList)):
             swapPosition = i
             for j in range(i, len(numberList)):
                 # find the smallest number
                 if numberList[j] < numberList[swapPosition]:
                     swapPosition = j
-
+            # swap the smallest number with the number in its new position
             swapData = numberList[i]
             numberList[i] = numberList[swapPosition]
             numberList[swapPosition] = swapData            
 
+            # check if the user wants to quit
             checkQuit()
+            # update display contents
             updateDisplay()
+        # record that the sorting has completed
         finished = True
         sortingAlgorithm = 0
+    # insertion sort
     elif sortingAlgorithm == 2:
+        # set start time, for use with on-screen timer
         startTime = time.time()
-        # insertion sort
+        # for each item in the list
         for i in range(0, len(numberList)):
             j = 0
+            # find its correct position
             while numberList[i] > numberList[j]:
                 j += 1
+            # put it in its correct position in the list
             numberList.insert(j, numberList.pop(i))
+            # check if the user wants to quit
             checkQuit()
+            # update display contents
             updateDisplay()
+        # record that the sorting has completed
         finished = True
         sortingAlgorithm = 0
     elif sortingAlgorithm == 3:
+        # set start time, for use with on-screen timer
         startTime = time.time()
         swapped = True
         while swapped:
             swapped = False
+            # for each item in the list
             for index, item in enumerate(numberList):
                 swappedInternal = False
+                # if the numbers are in the wrong position, swap them around
                 if index != len(numberList) - 1 and item > numberList[index + 1]:
                     numberList[index] = numberList[index + 1]
                     numberList[index + 1] = item
                     swapped = True
                     swappedInternal = True
+                # check if the user wants to quit
                 checkQuit()
+                # if items have been swapped, update display contents
                 if swappedInternal:
                     updateDisplay()
+        # record that the sorting has completed
         finished = True
         sortingAlgorithm = 0
+    # if sorting has completed
     elif finished:
+        # update display contents
         updateDisplay()
+        # check if the reset button has been pressed
         finished = checkResetButton()
+        # ensure reset button and exiting are both enabled
+        clock.tick(fps)
+        # check if the user wants to quit
+        checkQuit()
+        # ensure reset button and exiting are both enabled
+        clock.tick(fps)
+        # if reset button has been pressed, reset the list
         if not finished:
             numberList = originalNumberList.copy()
+            # update display contents
             updateDisplay()
-        checkQuit()
     else:
+        #check if the user wants to quit
         checkQuit()
+        # check if any of the start buttons have been pressed
         sortingAlgorithm = checkStartButtons()
\ No newline at end of file