Add debian-testing as apt source requirement to documentation (and explain better)

1 files changed, 8 insertions, 6 deletions

diff --git a/doc/INSTALL.md b/doc/INSTALL.md
index 7ce9e4d74..383203a6a 100644
--- a/doc/INSTALL.md
+++ b/doc/INSTALL.md
@@ -33,15 +33,17 @@ used to parse documents, host the site, etc.  There are also packages
 that contain headers necessary to compile some of the gem dependencies
 in the next step.
 
-If you are running Debian, you can use specially compiled mysociety
-packages by adding the following to `/etc/apt/sources.list` and
-running `apt-get update`:
+If you are running Debian, add the following repositories to
+`/etc/apt/sources.list` and run `apt-get update`:
 
     deb http://debian.mysociety.org squeeze main
+    deb http://ftp.debian.org/debian/ testing main non-free contrib
 
-If you don't set up that mySociety Debian source (e.g. if you're
-running Ubuntu), you should comment out `wkhtmltopdf-static` from
-`config/packages`, as it won't install in the next step
+The repositories above allow us to install the packages
+`wkthmltopdf-static` and `bundler` using `apt`; so if you're running
+Ubuntu, you won't be able to use the above repositories, and you will
+need to comment out those two lines in `config/packages` before
+following the next step (and install bundler manually).
 
 Now install the packages that are listed in config/packages using apt-get
 e.g.: