readme: how to composer install

phpstan · Nov 22, 2022 · d4ee144 · d4ee144
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diff --git a/README.md b/README.md
@@ -11,6 +11,14 @@ This repository (`phpstan/phpstan-src`) is for PHPStan's development only. Head
 
 Any contributions are welcome.
 
+### Installation
+
+```bash
+composer install
+```
+
+If you encounter dependency problem, try using `export COMPOSER_ROOT_VERSION=1.9.x-dev`
+
 ### Building
 
 PHPStan's source code is developed on PHP 8.1. For distribution in `phpstan/phpstan` package and as a PHAR file, the source code is transformed to run on PHP 7.2 and higher.