diff --git a/BubbleSort.py b/BubbleSort.py
index 2178d63..c50c20f 100644
--- a/BubbleSort.py
+++ b/BubbleSort.py
@@ -1,36 +1,51 @@
 import bpy
 import random 
-
+#variables
 count = 50
 cubes=[]
-locationList=[]
-scaleList=[]
+locations=[]
+scales=[]
+#fill arrays with numbers between 1 & count
 i = 1
 while i < count+1:
-    locationList.append(i)
-    scaleList.append(i)
-    i += 1
-random.shuffle(locationList)
-random.shuffle(scaleList)
+    locations.append(i)
+    scales.append(i)
+    i += 1 
+#randomize array order
+random.shuffle(locations)
+random.shuffle(scales)
+#create cubes with random location
 i = 0
 while i < count:
-    cube = bpy.ops.mesh.primitive_cube_add(location=(locationList[i], 0, 0), scale=(0.25, 0.25, 0.25))  
+    cube = bpy.ops.mesh.primitive_cube_add(location=(locations[i], 0, 0), scale=(0.25, 0.25, 0.25))  
     i+=1
+#assign random scale to all cubes and add them to array
 i = 0
 for ob in bpy.data.objects:
     if ob.type == 'MESH':    
-        ob.scale.z = scaleList[i]
+        ob.scale.z = scales[i]
         cubes.append(ob)
-        i += 1
+        i += 1  
+#insert keyframes on starting location for all cubes 
+i=0
+while i < count:
+    cubes[i].keyframe_insert(data_path="location", frame=0)
+    i += 1
+#bubble sort
 n = len(cubes)
 for i in range(n):
+    #insert keyframe for every cube on every frame
+    for cube in cubes:
+        cube.keyframe_insert(data_path="location", frame=i)
     already_sorted = True
     for j in range(n - i - 1):
         if cubes[j].scale.z > cubes[j + 1].scale.z:
+            #insert keyframes based on bubble sort
             cubes[j].location = (j, 0.0, 0.0)
             cubes[j].keyframe_insert(data_path="location", frame=i)
             cubes[j+1].location = (j-1, 0.0, 0.0)
             cubes[j+1].keyframe_insert(data_path="location", frame=i)
+            #rearrange arrays
             cubes[j], cubes[j + 1] = cubes[j + 1], cubes[j]
             already_sorted = False
     if already_sorted: