Update writeup_template.md

Author: ryan-keenan

writeup_template.md

@@ -36,7 +36,8 @@ The goals / steps of this project are the following:
 You're reading it!
 ###Camera Calibration
 
-####1. Briefly state how you computed the camera matrix and distortion coefficients.  
+####1. Briefly state how you computed the camera matrix and distortion coefficients. Provide an example of a distortion corrected calibration image.
+
 The code for this step is contained in the first code cell of the IPython notebook located in "./examples/example.ipynb" (or in lines # through # of the file called `some_file.py`).  
 
 I start by preparing "object points", which will be the (x, y, z) coordinates of the chessboard corners in the world. Here I am assuming the chessboard is fixed on the (x, y) plane at z=0, such that the object points are the same for each calibration image.  Thus, `objp` is just a replicated array of coordinates, and `objpoints` will be appended with a copy of it every time I successfully detect all chessboard corners in a test image.  `imgpoints` will be appended with the (x, y) pixel position of each of the corners in the image plane with each successful chessboard detection.