diff --git a/README.md b/README.md
index c7e3747..8000923 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,27 @@
-# Invaders
+# Rust + WebGL Rectangle
+
+Drawing a colored rectangle with Rust, WebAssembly and WebGL. The extensively
+commented main code is located in `src/draw.rs`.
+
+## Usage
+
+Initial setup:
+
+```sh
+wasm-pack build
+cd www
+npm install
+```
+
+Compile `.wasm` file:
+
+```sh
+wasm-pack build
+```
+
+Run development server:
+
+```sh
+cd www
+npm run start
+```