diff --git a/etc/apt/apt.conf.d/99tor b/etc/apt/apt.conf.d/99tor
index 8f73b85c..ad7debbe 100644
--- a/etc/apt/apt.conf.d/99tor
+++ b/etc/apt/apt.conf.d/99tor
@@ -1 +1,4 @@
+# I am using apt-transport-tor, but I have a suspicion it doesn't work for
+# apt-listchanges & apt-listbugs, so I still have the old Privoxy method
+# enabled. https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/apt
 Acquire::http::Proxy "http://127.0.0.1:8118/";
diff --git a/etc/apt/preferences.d/unstable b/etc/apt/preferences.d/unstable
index d35e406d..7264e8eb 100644
--- a/etc/apt/preferences.d/unstable
+++ b/etc/apt/preferences.d/unstable
@@ -1,3 +1,6 @@
+# Updating from testing only when apt is told to do so
+# https://wiki.debian.org/AptPreferences#Notes_from_JoshuaRodman
+# See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=725934 debsecan
 Package: *
 Pin: release a=testing
 Pin-Priority: 900