diff --git a/howto/tls.md b/howto/tls.md
index a149671ac4a7d75027be25ba78dee528091292c1..b8540444ef93297bf50e42a6395f0eff3f96eb6a 100644
--- a/howto/tls.md
+++ b/howto/tls.md
@@ -262,6 +262,10 @@ documentation.
 TODO: identify key TLS docs that should be linked to here. RFCs? LE
 upstream docs?
 
+The `letsencrypt-domains.git` repository is actually a fork of the
+"upstream" project, from Debian System Administrators (DSA), see
+[the upstream git repository](https://salsa.debian.org/dsa-team/mirror/letsencrypt-domains) for more information.
+
 # Discussion
 
 ## Overview