Update writeup_template.md

Author: ryan-keenan

writeup_template.md

@@ -51,7 +51,7 @@ I then used the output `objpoints` and `imgpoints` to compute the camera calibra
 ####1. Provide an example of a distortion-corrected image.
 To demonstrate this step, I will describe how I apply the distortion correction to one of the test images like this one:
 ![alt text][image2]
-####2. Describe how you used color transforms, gradients or other methods to create a thresholded binary image.  Provide an example of a binary image result.
+####2. Describe how (and identify where in your code) you used color transforms, gradients or other methods to create a thresholded binary image.  Provide an example of a binary image result.
 Oooh, binary image... you mean like this one?  (note: this is not from one of the test images)
 
 ![alt text][image3]