diff --git a/README.md b/README.md
index c631a13..1caed36 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,16 @@ These can be obtained from your package manager.
 
 	./dev.sh
 
-or on Windows, if you have PHP and sqlite3 available in path:
+On Windows, you have to perform a `composer install` manually beforehand. Make sure you have PHP and sqlite3 available in path:
 
 	dev.bat
+
+### Dependency management
+
+`dev.sh` will download the `composer` package manager to the php archive file `composer.phar` and run it.
+Composer will check for the php extension `pdo_sqlite` which must be enabled on your system. This usually includes installing a php-sqlite3 package and enabling it in /etc/php/php.ini.
+
+    php composer.phar update
+    php composer.phar install
+
+## Hosting