diff --git a/README.md b/README.md
index 4305199..a8d9180 100644
--- a/README.md
+++ b/README.md
@@ -111,6 +111,7 @@ You should now be able to send your IoC-containing mails to misp_handler@YOURDOM
 
 - mail_to_misp requires access to a MISP instance (via API).
 - Python 3
+- dnspython
 - faup from https://github.com/stricaud/faup
 - urlmarker from https://github.com/rcompton/ryancompton.net/blob/master/assets/praw_drugs/urlmarker.py (contained in this project)
 - ftfy from https://github.com/LuminosoInsight/python-ftfy (to fix unicode text)