diff --git a/main.py b/main.py
index 1fdfe75..3276bac 100644
--- a/main.py
+++ b/main.py
@@ -31,6 +31,8 @@ IndexedFaceSet = list[IndexedFace]
 
 
 def to_viewport(verts: Vertex2Set) -> Vertex2Set:
+    """Maps vertices into the [0, WIDTH]x[0, HEIGHT] viewport"""
+
     def transform(vert: Vertex2) -> Vertex2:
         return (
             ((vert[0] + 1.0) / 2.0) * CANVAS_SIZE,
@@ -41,6 +43,8 @@ def to_viewport(verts: Vertex2Set) -> Vertex2Set:
 
 
 def to_imageplane(verts: Vertex3Set) -> Vertex2Set:
+    """Projects vertices onto the [-1, 1]x[-1, 1] imageplane"""
+
     def transform(vert: Vertex3) -> Vertex2:
         return (vert[0] / vert[2], vert[1] / vert[2])
 
@@ -48,6 +52,8 @@ def to_imageplane(verts: Vertex3Set) -> Vertex2Set:
 
 
 def translate(verts: Vertex3Set, distance: float) -> Vertex3Set:
+    """Translates vertices along the forward-axis in 3D space"""
+
     def transform(vert: Vertex3) -> Vertex3:
         return (vert[0], vert[1], vert[2] + distance)
 
@@ -55,6 +61,8 @@ def translate(verts: Vertex3Set, distance: float) -> Vertex3Set:
 
 
 def rotate(verts: Vertex3Set, angle: float) -> Vertex3Set:
+    """Rotates vertices around the up-axis in 3D space"""
+
     def transform(vert: Vertex3) -> Vertex3:
         return (
             vert[0] * cos(angle) - vert[2] * sin(angle),
@@ -86,9 +94,10 @@ def draw(drawlist, vertices: Vertex3Set, faces: IndexedFaceSet, time: float):
             thickness=EDGE_SIZE,
         )
 
-    viewport_vertices: Vertex2Set = to_viewport(
-        to_imageplane(translate(rotate(vertices, time), CAMERA_DISTANCE))
-    )
+    rotated_vertices: Vertex3Set = rotate(vertices, time)
+    translated_vertices: Vertex3Set = translate(rotated_vertices, CAMERA_DISTANCE)
+    imageplane_vertices: Vertex2Set = to_imageplane(translated_vertices)
+    viewport_vertices: Vertex2Set = to_viewport(imageplane_vertices)
 
     if RENDER_VERTICES:
         for v in viewport_vertices: