diff --git a/content/pages/about.md b/content/pages/about.md
index 91cdaa2..44e8a96 100644
--- a/content/pages/about.md
+++ b/content/pages/about.md
@@ -10,5 +10,6 @@ My name is *Paul-Nicolas Madelaine*, often shortened to *PNM*. My pronouns are
 This website is built with [Pelican](https://getpelican.com/) and
 [Nix](https://nixos.org/), source code is available on
 [GitHub](https://github.com/pnmadelaine/website). The domain name *pnm.tf* is
-registered at [Gandi](https://www.gandi.net) and the top-level domain *.tf* is
-administrated by [AFNIC](https://www.afnic.fr).
+registered at [Gandi](https://www.gandi.net/) and the top-level domain *.tf* is
+administrated by [AFNIC](https://www.afnic.fr/). Certificates are provided by
+[Let's Encrypt](https://letsencrypt.org/).