diff --git a/dnsupdate.1 b/dnsupdate.1
index 8ca7768..47d699f 100644
--- a/dnsupdate.1
+++ b/dnsupdate.1
@@ -10,7 +10,11 @@
 Dnsupdate is a utility to let a host with a dynamic IP address securely update it's master name server using a TSIG key.
 
 .SS "Requirements"
-Dnsupdate is written in Python and uses the dnspython toolkit which can be found at \fIhttp://www.dnspython.com/\fP.
+Dnsupdate is written in Python and requires Python > 2.0 to be installed. 
+
+It also uses the dnspython toolkit which can be found at \fIhttp://www.dnspython.com/\fP.
+
+If a Python version before 2.3 is used the Optik toolkit is required. It provides parsing of command line paramters and can be found at \fihttp://optik.sourceforge.net/\fP.
 
 .SS "Name Server configuration"
 In order for dnsupdate to work the name server must be configured to allow dynamic updates using a TSIG key.