diff --git a/README.md b/README.md
index c9b9ec7..3fa163d 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ Following roles have been defined for making a server configuration easy:
 - **bootstrap** defines a way to connect to a server which has not been configured yet, changes user password and hardening SSH access
 - **common** defines the installation of common packages and common configurations like firewall
 - **dns** defines roles for handling dns authorities and slaves, uses *bind9*
-  - **application** installs main application
+  - **application** installs main application (installs from bind9 official repository)
   - **master** configures a dns authority with support of DNSSEC for a domain
   - **slave** configures an automatic cloning slave for a domain
 - **git_auto_update** adds an auto update mechanism for a git repository based on signed release tags