diff --git a/README.md b/README.md
index 0b420cf..f5e6808 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,10 @@
 # dnstools
 DNS Diagnostics and Performance Measurement Tools
+
+# prerequirements
+This script requires python3 as well as latest [dnspython](http://www.dnspython.org/)
+
+# todo
+- input sanitization
+- proper signal handling
+