diff --git a/README.md b/README.md
index e41794d..4cb6dfb 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Chat Demo
 
+## Build and start demo
+
 - Install Rust toolchain
 - Install Node.js
 - Install [wasm-pack](https://github.com/rustwasm/wasm-pack)
@@ -8,3 +10,9 @@
 - Start web server in directory `chat-frontend`
   - `npm start`
 - Open `http://localhost:8080/` in a browser 
+
+## Building plugin
+
+The server loads a plugin as WebAssembly.
+The binary is already stored in chat-server.
+To build the plugin, switch to the directory `plugin` and start the build process with the command `cargo build`.