Writer's block?

I have to write a three page (single spaced) paper on a CS subject of my choice. I am having problems filling up the pages. I chose heapsort as my topic. I understand the algorithm, an know some basic facts about it, but I'm still having trouble filling up the pages. I guess this doesn't qualify as writer's block, there is plenty to write about, it is more a lack of motivation and will. This does not feel like a 10% assignment.


TL;DR: writing is painful.