diff --git a/admin_manual/installation/source_installation.rst b/admin_manual/installation/source_installation.rst
index f3694d9a2..13d0796b8 100644
--- a/admin_manual/installation/source_installation.rst
+++ b/admin_manual/installation/source_installation.rst
@@ -105,6 +105,7 @@ Required:
 * PHP module curl
 * PHP module dom
 * PHP module GD
+* PHP module hash
 * PHP module iconv
 * PHP module JSON
 * PHP module libxml (Linux package libxml2 must be >=2.7.0)