docs: what is this?

Signed-off-by: Lexus Drumgold <unicornware@flexdevelopment.llc>

README.md

@@ -2,15 +2,15 @@
 
 [![github release](https://img.shields.io/github/v/release/flex-development/estree-util-unassert.svg?include_prereleases&sort=semver)](https://github.com/flex-development/estree-util-unassert/releases/latest)
 [![npm](https://img.shields.io/npm/v/@flex-development/estree-util-unassert.svg)](https://npmjs.com/package/@flex-development/estree-util-unassert)
-[![codecov](https://codecov.io/gh/flex-development/estree-util-unassert/graph/badge.svg?token=)](https://codecov.io/gh/flex-development/estree-util-unassert)
+[![codecov](https://codecov.io/gh/flex-development/estree-util-unassert/graph/badge.svg?token=qbrCLnCoJp)](https://codecov.io/gh/flex-development/estree-util-unassert)
 [![module type: esm](https://img.shields.io/badge/module%20type-esm-brightgreen)](https://github.com/voxpelli/badges-cjs-esm)
 [![license](https://img.shields.io/github/license/flex-development/estree-util-unassert.svg)](LICENSE.md)
 [![conventional commits](https://img.shields.io/badge/-conventional%20commits-fe5196?logo=conventional-commits&logoColor=ffffff)](https://conventionalcommits.org/)
 [![typescript](https://img.shields.io/badge/-typescript-3178c6?logo=typescript&logoColor=ffffff)](https://typescriptlang.org/)
 [![vitest](https://img.shields.io/badge/-vitest-6e9f18?style=flat&logo=vitest&logoColor=ffffff)](https://vitest.dev/)
 [![yarn](https://img.shields.io/badge/-yarn-2c8ebb?style=flat&logo=yarn&logoColor=ffffff)](https://yarnpkg.com/)
 
-[estree][estree] (and [esast][esast]) utility to remove assertions
+[estree][estree] (and [esast][esast]) utility to remove [assertions][assertion]
 
 ## Contents
 
@@ -24,7 +24,7 @@
 
 ## What is this?
 
-**TODO**: what is this?
+This package is a utility that replaces and removes assertions in JavaScript syntax trees.
 
 ## When should I use this?
 
@@ -77,6 +77,7 @@ This package is fully typed with [TypeScript][typescript].
 
 See [`CONTRIBUTING.md`](CONTRIBUTING.md).
 
+[assertion]: https://en.wikipedia.org/wiki/Assertion_(software_development)
 [esast]: https://github.com/syntax-tree/esast
 [esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
 [esmsh]: https://esm.sh/