Wikipedia represents a revolution in the way knowledge is communicated and a potential threat to traditional encyclopedias. Wikipedia is widely used as a reference in academic assignments. Unfortunately, for the neophyte, it may be hard to assess the completeness and the accuracy of a contribution to Wikipedia. In this article, we describe an assignment to show students how to read a Wikipedia scientific article critically and how to correct it appropriately, if necessary. The assignment has proven to be beneficial to the students while demonstrating how to analyze, understand, and write a contribution to Wikipedia. (Contains 1 table.)