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diff --git a/README.md b/README.md
index 6782e97..e42b242 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ https://github.com/m3m0r7/rubyvm-on-php is a RubyVM written in pure PHP.
 It works on the PHP runtime on my Wasm runtime.
 
 ```
+$ composer install
 $ composer example:rubyvm-on-php-on-wasm
 ```