diff --git a/README.md b/README.md
index ae6e0d7..0a6b036 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,13 @@ borked for 2 minutes once every few months shouldn't be an issue.
 Although this is not new, maybe a bit young (from 2012), this technology isn't
 widely spread.
 
+## Security addendum
+
+Although it provides a bit more security, as it prevents MITM attacks from
+downgrading your TLS (or disable it all together), I would ***strongly*** recommend
+to send sensitive emails **only** using PGP encryption! Plain text emails are
+privacy nightmares!
+
 ## References and links
 
 - Article from Abyss Project: [link](https://www.abyssproject.net/2016/09/creer-utiliser-enregistrements-tlsa-dane/)