diff --git a/doc/02-Installation.md b/doc/02-Installation.md
index e5a077c4a..0cc8dc709 100644
--- a/doc/02-Installation.md
+++ b/doc/02-Installation.md
@@ -18,7 +18,8 @@ chapter.
   * Older versions (5.6+) are only supported up until version 2.11
 * [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
+* The following PHP modules must be installed: cURL, json, gettext, intl, dom, OpenSSL and xml
+* For exports to PDF also the following PHP modules are required: mbstring, GD, Imagick
 * LDAP PHP library when using Active Directory or LDAP for authentication
 * MySQL or PostgreSQL PHP libraries