Web anachronisms: Google as a verb?

A difficult literary question: I used the word “google” as a verb in a short story. 50 or 100 years from now, will people even understand what the word means? Or will you need a footnote:

google (verb): to use a search engine to find information, named after one of the first companies to offer it as a free service to people. During that era (dating from 1998 to 2010), the Google corporation dominated the search engine business so much that it became synonymous with the word “search.”