When you create a repository on GitHub, you can optionally create a description of the repository. Unfortunately, I wrote a description that no longer adequately describes the code in the repo.
How do I change the repo description?
Meta-information about the repository can be changed by clicking on a cog icon in the right-hand side menu's "About" section:
Upon doing so, a popup will appear where the description, website, topics, and homepage settings can be configured: