diff --git a/etc/apt/sources.list/README.md b/etc/apt/sources.list/README.md
new file mode 100644
index 00000000..bcb3dd4d
--- /dev/null
+++ b/etc/apt/sources.list/README.md
@@ -0,0 +1,18 @@
+sources.list files for Ubuntu and Debian
+========================================
+
+The files have been named so they are easily to fetch with script,
+`lsb_release -sr` returns release e.g. `14.04` or `testing` and
+`lsb_release -rc` returns codename e.g. `jessie`.
+
+`mirrors.ubuntu.com/mirrors.txt` and `httpredir.debian.org` are used so
+the files work everywhere and the nearest mirrors are always used no matter
+where you are.
+
+Which script to use?
+
+* `install` for Ubuntu and Debian testing/unstable.
+    * If you run `ìnstall` on Debian Stable, sources.list will say
+      `stable` and when new Debian becomes stable apt wants to
+      upgrade to it directly and that can be dangerous.
+* `install.debian` for not-rolling Debian.
diff --git a/etc/apt/sources.list/install b/etc/apt/sources.list/install
new file mode 100644
index 00000000..e69de29b
diff --git a/etc/apt/sources.list/install.debian b/etc/apt/sources.list/install.debian
new file mode 100644
index 00000000..e69de29b