diff --git a/README.md b/README.md
index 594f3a6..b7b6895 100644
--- a/README.md
+++ b/README.md
@@ -5,9 +5,11 @@ This script is used to test the response time of dns servers.
 
 ## Prequisites
 
-dnspython
+dnspython 2.0.0 or more
 ```
 python3 -m pip install dnspython
+#In case you need to upgrade add the --upgrade argument
+
 ```
 
 ## Usage