diff --git a/telemetry/code/monitor/graph_plotter_rewrite.py b/telemetry/code/monitor/graph_plotter_rewrite.py
index e054e08..d9b23b7 100755
--- a/telemetry/code/monitor/graph_plotter_rewrite.py
+++ b/telemetry/code/monitor/graph_plotter_rewrite.py
@@ -1,5 +1,11 @@
 #!/usr/bin/env python
 
+# Tool to draw live graphs of data coming in from serial port
+# Written as a telemetry tool by:
+# The UoN Robot Wars Project, 2018
+
+# This code is incomplete, and is missing core features
+
 import pyglet
 #import math
 #import time
@@ -19,12 +25,14 @@ timeout=1
 
 class Series:
     def __init__(self, points=100, title="Series title", xname="x-axis name", yname="y-axis name"):
+        """Set up an object to store a 2D data series"""
         self.title = title
         self.xname = xname
         self.yname = yname
         self.data = []
         self.points = points
     def addpoint(self, point):
+        """Add a point to the dataset, and remove the oldest, if necessary"""
         self.data.append(point)
         if len(self.data) > self.points:
             del self.data[0]
@@ -41,6 +49,7 @@ class Plot(pyglet.window.Window):
         self.set_caption(self.series.title)
         
     def on_resize(self, width, height):
+        """Handle a resize event from the pyglet event loop"""
         self.bounds = ((int(self.width * self.margins[0]), int(self.width * (1 - self.margins[0]))),
                 (int(self.height * self.margins[1]), int(self.height * (1 - self.margins[1]))))
         pyglet.window.Window.on_resize(self, width, height)
@@ -66,6 +75,7 @@ class Plot(pyglet.window.Window):
         heading.draw()
      
     def drawAxis(self, axis): # axis=0 is x, 1 is y
+        """Draw the gridlines and labels for one axis, specified in the last argument"""
         limita = self.bounds[1-axis][1]
         limitb = self.bounds[1-axis][0]
         start = self.bounds[axis][0]
@@ -97,23 +107,17 @@ class Plot(pyglet.window.Window):
                                                 font_name=self.font, font_size=self.height*self.margins[axis]*0.3,
                                                 x=0, y=self.height/2,
                                                 anchor_x='center', anchor_y='top')
-                pyglet.gl.glPushMatrix()
+                pyglet.gl.glPushMatrix()   # Set up a new context to avoid confusing the main one
+                # Tranformation to rotate label, and ensure it ends up in the right place
                 pyglet.gl.glTranslatef(self.height//2, self.height//2, 0.0)
-                pyglet.gl.glRotatef(90.0, 0.0, 0.0, 1.0) 
+                pyglet.gl.glRotatef(90.0, 0.0, 0.0, 1.0)
+                # Draw the axis title using the rotated coordinate system
                 axistitle.draw()
+                # Return everything to its previous state
                 pyglet.gl.glPopMatrix()
-                #pyglet.gl.glRotatef(-90.0, 0.0, 0.0, 1.0)
-                #pyglet.gl.glTranslatef(-self.width//2, -self.height//2, 0.0)
 
             tag.draw()
         
-
-
-            
-
-        
-        
-        
 testseries = Series()
 
 plots = []         
@@ -121,10 +125,11 @@ plots.append(Plot(testseries))
 
 def pollSerial(elapsed):
     """Check serial port for incoming data"""
-    # Note, elapsed is time since last call of this function
+    # Note: 'elapsed' is time since last call of this function
     values = datafeed.readline().strip().split(", ")
     testseries.addpoint(values)
 
+# Pyglet looks after the main event loop, but this ensures that data keeps being read in
 pyglet.clock.schedule_interval(pollSerial, 0.1)
 
 pyglet.app.run()
\ No newline at end of file
--
libgit2 0.21.2