diff --git a/README.md b/README.md
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@@ -1 +1,11 @@
-# csu [![CI](https://github.com/cl0wng1rl/csu/actions/workflows/ci.yml/badge.svg)](https://github.com/cl0wng1rl/csu/actions/workflows/ci.yml) [![codecov](https://codecov.io/github/cl0wng1rl/csu/branch/main/graph/badge.svg?token=RfkXLINOJV)](https://codecov.io/github/cl0wng1rl/csu)
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+# csu [![CI](https://github.com/cl0wng1rl/csu/actions/workflows/ci.yml/badge.svg)](https://github.com/cl0wng1rl/csu/actions/workflows/ci.yml) [![codecov](https://codecov.io/github/cl0wng1rl/csu/branch/main/graph/badge.svg?token=RfkXLINOJV)](https://codecov.io/github/cl0wng1rl/csu)
+
+## Case Switch Util
+
+`csu` is a command line tool designed to make switching the case of text easy.
+
+### Example
+
+`% csu "hello world" -c upper`
+
+`> HELLO WORLD`
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