diff --git a/button.py b/button.py
index a77e1d9..ef07527 100644
--- a/button.py
+++ b/button.py
@@ -1,3 +1,11 @@
+"""Provides a `ButtonManager` for drawing and interacting with buttons.
+
+A `Button` has an ID, a position, and some text or a background.
+Multiple buttons can be added to a ButtonManager, and then they are all
+checked at once when the mouse is pressed. The button manager then returns
+the ID of the button that was pressed.
+"""
+
 from typing import Callable, List, Optional
 from PIL import Image
 import math
diff --git a/canvas.py b/canvas.py
index 0f37eb6..1b74751 100644
--- a/canvas.py
+++ b/canvas.py
@@ -1,3 +1,20 @@
+"""Provides a wrapper struct that is meant to simulate a TKinter canvas.
+
+This canvas allows for using the same GUI/text drawing code between both
+the TKinter and OpenGL backends.
+It draws on a PIL image and then renders to an OpenGL texture.
+
+In theory any set of drawing calls to this canvas should appear identical
+to the same set of drawing calls to a TKinter canvas...
+...but it's not perfect.
+
+Due to a limitation in PIL drawing functions, this canvas does not have
+an alpha channel that works properly. Instead, any pixels that are
+ALPHA_COLOR are removed from the image.
+
+I miss the TKinter canvas.
+"""
+
 from shader import ShaderProgram
 import typing
 from PIL import Image, ImageDraw, ImageFont
diff --git a/craft.py b/craft.py
index 920d3f5..ef05636 100644
--- a/craft.py
+++ b/craft.py
@@ -1,3 +1,35 @@
+"""The main entry point of the app.
+
+All of the different parts of the game are divided into "Modes".
+Any events that occur are delegated to the current mode to be handled.
+The modes act like an FSM. For example, pressing 'E' in `PlayingMode` will
+result in a transition to the `InventoryMode` state.
+
+# WorldLoadMode #
+Displays a loading screen while a World is generated or loaded from disk.
+
+# WorldListMode #
+Displays a list of the currently saved worlds and allows the player to 
+select one or create a new world.
+
+# CreateWorldMode #
+Displays various options the player can set to create a new world. 
+
+# TitleMode # 
+Used at the title screen. Not very exciting.
+
+# ChatMode #
+Used when the chat box is opened during gameplay.
+
+# PlayingMode #
+The 'normal' state of gameplay. The player can walk, look around, etc.
+
+# InventoryMode #
+Used when the player has an inventory window opened. This can include
+when the player right clicks on, for example, a furnace or a crafting table.
+This mode keeps a reference to what kind of GUI is opened.
+"""
+
 import openglapp
 from PIL import Image
 from PIL import ImageDraw
diff --git a/entity.py b/entity.py
index 9018c07..316a0c4 100644
--- a/entity.py
+++ b/entity.py
@@ -1,4 +1,17 @@
-from os import X_OK
+"""Rendering, representation, and behavior of entities is handled here.
+
+Entity models are made up of bones. Each bone is individually posable. 
+Each bone is made up of cubes, which stay in a fixed arrangement.
+
+Every entity has a `kind`, which determines its attributes and behavior.
+
+For behavior, an `Ai` is used. This simply stores a list of `Task`s.
+Tasks run every tick until they are interrupted by a task with a higher
+priority, or when they mark themselves as finished.
+For example, most entities have a `WanderTask` with low priority, so when
+they do not have any other goals, they will occasionally move around.
+"""
+
 from typing import List, Tuple, Optional, Any
 import json
 import numpy as np
@@ -346,8 +359,6 @@ def __init__(self, app, kind: str, x: float, y: float, z: float):
 
         self.kind = app.entityKinds[kind]
 
-        data: EntityKind = app.entityKinds
-
         self.radius = self.kind.radius
         self.height = self.kind.height
         self.walkSpeed = self.kind.walkSpeed
@@ -355,7 +366,6 @@ def __init__(self, app, kind: str, x: float, y: float, z: float):
         self.ai = copy.deepcopy(self.kind.ai)
     
     def hit(self, damage: float, knockback: Tuple[float, float]):
-        print("got hit")
         if self.immunity == 0:
             self.health -= damage
 
@@ -587,20 +597,23 @@ def makePathFromChain(prevDirs, end: BlockPos) -> List[BlockPos]:
 
     return result
 
-def findPath(start: BlockPos, end: BlockPos, world) -> Optional[List[BlockPos]]:
-    print(f"Start pos: {start} End pos: {end}")
+def approxDistance(start: BlockPos, end: BlockPos):
+    # Chebyshev distance
+
+    xDist = abs(start.x - end.x)
+    yDist = abs(start.y - end.y)
+    zDist = abs(start.z - end.z)
 
-    def heuristic(start: BlockPos, end: BlockPos):
-        # Chebyshev distance
+    return (max(xDist, zDist) + yDist)
 
-        xDist = abs(start.x - end.x)
-        yDist = abs(start.y - end.y)
-        zDist = abs(start.z - end.z)
 
-        return (max(xDist, zDist) + yDist)
+def findPath(start: BlockPos, end: BlockPos, world, maxDist=1) -> Optional[List[BlockPos]]:
+    print(f"Start pos: {start} End pos: {end}")
 
     # https://en.wikipedia.org/wiki/A*_search_algorithm
 
+    heuristic = approxDistance
+
     prevDirs = dict()
 
     realCosts = { start: 0 }
@@ -622,7 +635,7 @@ def heuristic(start: BlockPos, end: BlockPos):
 
         openSet.remove(current)
         
-        if current == end:
+        if heuristic(current, end) <= maxDist:
             return makePathFromChain(prevDirs, end)
 
         for nextPos in destinations(current, world):
diff --git a/openglapp.py b/openglapp.py
index a7e73e5..346e488 100644
--- a/openglapp.py
+++ b/openglapp.py
@@ -1,3 +1,5 @@
+"""This simulates the events and functionality of `cmu_112_graphics`."""
+
 import glfw
 import inspect
 import time
@@ -42,6 +44,7 @@ def __init__(self, width=300, height=300):
 
         self.run()
     
+    # From cmu_112_graphics
     def _callFn(self, fn, *args):
         if (fn in self._callersGlobals): self._callersGlobals[fn](*args)
     
diff --git a/perlin.py b/perlin.py
index fca1cda..dba8c67 100644
--- a/perlin.py
+++ b/perlin.py
@@ -1,3 +1,10 @@
+"""This module is used for sampling perlin noise.
+
+getPerlinNoise returns a single level of the noise.
+getPerlinFractal returns several layers of noise added together, which is
+used for the height of terrain during worldgen.
+"""
+
 import random, math
 from functools import lru_cache
 
diff --git a/player.py b/player.py
index 267f0bd..b8c6123 100644
--- a/player.py
+++ b/player.py
@@ -1,3 +1,15 @@
+"""Simply represents the player and their inventory.
+
+Slot *should* probably be titled `ItemStack` but I haven't gotten 
+around to that yet. It represents an item and an amount of that item.
+
+Most of the player's behavior actually happens in `craft.py`,
+which I may move in the future.
+
+A player is simply an `Entity` with a few extra attributes, so there's
+not that much too this module.
+"""
+
 from entity import Entity
 from typing import List, Optional
 from dataclasses import dataclass
@@ -33,10 +45,6 @@ def tryMergeWith(self, other: 'Slot') -> Optional['Slot']:
             return None
 
 class Player(Entity):
-    height: float
-    radius: float
-
-    walkSpeed: float
     reach: float
 
     hotbarIdx: int = 0
diff --git a/profilecraft.py b/profilecraft.py
index 1a82d49..89ac063 100644
--- a/profilecraft.py
+++ b/profilecraft.py
@@ -1,3 +1,5 @@
+"""A simple shim script to profile 112craft"""
+
 import cProfile
 import craft
 import pstats
diff --git a/render.py b/render.py
index a1ca90b..e97f6ff 100644
--- a/render.py
+++ b/render.py
@@ -1,3 +1,15 @@
+"""This module does all of the drawing for both backends.
+
+In particualar, it has:
+- View and camera matrix calculation
+- The entire process of drawing models
+- Hidden surface/view frustrum/back face culling
+- GUI drawing helper functions
+
+This module does NOT handle mesh/buffer creation. Those are created in
+the modules where they are needed. This one is only for drawing them.
+"""
+
 import math
 import time
 from tkinter.constants import X
diff --git a/resources.py b/resources.py
index 563c90a..36cadb9 100644
--- a/resources.py
+++ b/resources.py
@@ -1,3 +1,9 @@
+"""This module is used to manage most of the game's assets.
+
+Textures, block attributes, mob kinds, etc. are all loaded into the `app`.
+This also creates the texture atlas used for rendering chunks.
+"""
+
 import numpy as np
 import world
 import render
diff --git a/shader.py b/shader.py
index f0c3ffe..844f709 100644
--- a/shader.py
+++ b/shader.py
@@ -1,3 +1,5 @@
+"""This module represents a vertex+fragment shader pair."""
+
 from OpenGL.GL import * #type:ignore
 
 def readFile(path):
diff --git a/tick.py b/tick.py
index 6f4f7fe..287141c 100644
--- a/tick.py
+++ b/tick.py
@@ -1,3 +1,9 @@
+"""Provides the `tick` function, which does all of the game's updates.
+
+At regular intervals, the AI of all entities are processed, gravity is applied,
+new entities are spawned, other entities are removed, collisions occur, etc.
+"""
+
 from entity import Entity
 from util import BlockPos, roundHalfUp, rayAABBIntersect
 import world
diff --git a/util.py b/util.py
index c279208..25b56b8 100644
--- a/util.py
+++ b/util.py
@@ -1,4 +1,7 @@
-"""Types and functions useful for the whole codebase."""
+"""Various types and functions useful for the whole codebase.
+
+Very important are BlockPos, ChunkPos, BlockId, and ItemId.
+"""
 
 import decimal
 from typing import NamedTuple, Tuple, Optional