diff --git a/Reference-Manual.mediawiki b/Reference-Manual.mediawiki
index 570d1e4..6309a4e 100644
--- a/Reference-Manual.mediawiki
+++ b/Reference-Manual.mediawiki
@@ -196,8 +196,7 @@ The standalone ModSecurity is located at https://www.modsecurity.org/download.ht
 === Preinstallation Steps ===
 To build the standalone module from source on a GNU/Linux platform, you need to install the standard and development packages for apache and prce. For example:
 <pre>
-# RHEL/CentOS style install
-
+# RHEL/CentOS style install. You may also need systemd-devel on newer versions
 sudo yum install httpd httpd-devel pcre pcre-devel libxml2-devel 
 </pre>
 <pre>