use deb.d.o instead of httpredir.d.o as example mirror

The service behind httpredir.debian.org is decommissioned and the domain
points to the deb.debian.org service, so following the redirect and
explaining the effects it has a bit is a good idea.

1 files changed, 12 insertions, 5 deletions

diff --git a/README.md b/README.md
index 58b95e0..84b8772 100644
--- a/README.md
+++ b/README.md
@@ -10,14 +10,21 @@ with "tor+http://" or "tor+https://" in your sources.list.
 Edit your /etc/apt/sources.list like so, adjusting the suite/components
 appropriately for your system:
 
-    deb     tor+http://httpredir.debian.org/debian unstable main
-    deb-src tor+http://httpredir.debian.org/debian unstable main
+    deb     tor+http://deb.debian.org/debian unstable main
+    deb-src tor+http://deb.debian.org/debian unstable main
 
-Note the use of httpredir.debian.org so that a mirror close to your exit node
-will be automatically chosen.
+Note that [deb.debian.org](https://deb.debian.org/) is backed by a set of
+commercial [CDN](https://en.wikipedia.org/wiki/Content_delivery_network)s,
+so that you will likely be served by one of their servers close (in network
+terms) to the exit node of your connection automatically.
+
+You can of course use any other Debian mirror from the extensive [mirror
+list](https://debian.org/mirror/list), but that might result in a connection
+"across the globe" if the choosen exit node is far away from the mirror causing
+slower connection speeds.
 
 Alternatively, if you have the Tor onion service address of a Debian
-mirror, you can use that:
+mirror, you can use that to have your traffic never leave the Tor network:
 
     deb     tor+http://<long string>.onion/debian unstable main
     deb-src tor+http://<long string>.onion/debian unstable main