diff --git a/server/conf/apache_ispconfig.conf.master b/server/conf/apache_ispconfig.conf.master
index 2a7ac0662e9f9cbc427330016bd903b979550dc7..2b6038c54aa420817a0198a4b91d8ac4455f3d56 100644
--- a/server/conf/apache_ispconfig.conf.master
+++ b/server/conf/apache_ispconfig.conf.master
@@ -1,3 +1,6 @@
+# Important: A copy of this file exists in install/tpl/ folder.
+# Edit both files when applying changes.
+
 ################################################
 # ISPConfig General Apache Options
 ################################################