diff --git a/install/tpl/apache_ispconfig.conf.master b/install/tpl/apache_ispconfig.conf.master
index 2a7ac0662e9f9cbc427330016bd903b979550dc7..c968abf3679777acd99fa6b8ddbee89524d43956 100644
--- a/install/tpl/apache_ispconfig.conf.master
+++ b/install/tpl/apache_ispconfig.conf.master
@@ -1,3 +1,6 @@
+# Important: A copy of this file exists in server/conf/ folder.
+# Edit both files when applying changes.
+
 ################################################
 # ISPConfig General Apache Options
 ################################################