diff --git a/admin_manual/installation/source_installation.rst b/admin_manual/installation/source_installation.rst
index 974aca4d0..b4caa2f51 100644
--- a/admin_manual/installation/source_installation.rst
+++ b/admin_manual/installation/source_installation.rst
@@ -37,6 +37,7 @@ Required:
 * PHP module ctype
 * PHP module curl
 * PHP module dom
+* PHP module filter (only on Mageia and FreeBSD)
 * PHP module GD
 * PHP module hash (only on FreeBSD)
 * PHP module iconv