diff --git a/README.md b/README.md
index c02edd0..7a82ab6 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,9 @@
 
 Source: http://www.btteknik.net/?p=143
 
+### Requirements
+* DiG
+
 ### DNSSEC key
 * need to create a dnssec key, so that we can authenticate clients' updates
 ```