diff --git a/doc/02-Installation.md b/doc/02-Installation.md
index c4938b34b..b2639c7c4 100644
--- a/doc/02-Installation.md
+++ b/doc/02-Installation.md
@@ -15,6 +15,8 @@ chapter.
 * [Icinga 2](https://icinga.com/products/icinga-2/) with the IDO database backend (MySQL or PostgreSQL)
 * A web server, e.g. Apache or Nginx
 * PHP version >= 5.6.0
+* [Icinga PHP Library (ipl)](https://github.com/Icinga/icinga-php-library) (>= 0.6)
+* [Icinga PHP Thirdparty](https://github.com/Icinga/icinga-php-thirdparty) (>= 0.10)
 * The following PHP modules must be installed: cURL, gettext, intl, mbstring, OpenSSL and xml
 * LDAP PHP library when using Active Directory or LDAP for authentication
 * MySQL or PostgreSQL PHP libraries