Add information on the public rsync and Git interfaces to the package description

debian/changelog

@@ -10,7 +10,8 @@ debian-keyring (2016.12.xx) UNRELEASED; urgency=medium
   * Add new DD key 0x88D24287A2D898B1 (Adrian Bunk) (RT #6490)
   * Add new DM key 0x2D192CA624770276 (Mario Anthony Limonciello) (RT
     #6499)
-  * Add information on the public Git tree to the package
+  * Add information on the public rsync and Git interfaces to the package
+    description
 
  -- Jonathan McDowell <noodles@earth.li>  Mon, 05 Dec 2016 11:17:51 +0000
 

debian/control

@@ -23,7 +23,12 @@ Description: GnuPG keys of Debian Developers and Maintainers
  Maintainers.
  .
  Do note that, although this package is provided for convenience, it
- is not necessarily kept updated with the latest changes; the following
- Git repository is kept up to date with the authoritative data:
+ is not necessarily kept updated with the latest changes; the authoritative
+ source for keyring information is publicly accessible via rsync at:
+ .
+ keyring.debian.org::keyrings/keyrings/
+ .
+ Finally, the following Git repository is usually kept up to date with the 
+ public authoritative data:
  .
  https://anonscm.debian.org/git/keyring/keyring.git