Expand section on installation on Redhat.

R1/source/releases/install_redhat.rst

 .. _install_redhat:
 
-Installation on RedHat
-======================
+Installation on Red Hat Linux
+=============================
 
-Installing Varnish Cache is as simple as enabling our package
-repository and installing the packages. Varnish Cache 4.0 and 4.1
-are supported on EL6 and EL7.
+Varnish Cache is packaged in RPMs for easy installation and upgrade on Red Hat
+systems.
+
+
+Official packages
+-----------------
+
+The Varnish Cache project maintains official packages for the current Enterprise Linux versions.
+Varnish Cache 4.0 and 4.1 are supported on EL6 and EL7.
 
 Varnish 4.1
------------
+~~~~~~~~~~~
 
 If you are on a compatible Linux distribution, use::
 
@@ -18,7 +24,7 @@ If you are on a compatible Linux distribution, use::
     yum install varnish
 
 Varnish 4.0
------------
+~~~~~~~~~~~
 
 If you are on RHEL 6 or a compatible distribution, use::
 
@@ -32,11 +38,18 @@ For RHEL 7 and compatible distributions, use::
     rpm --nosignature -i https://repo.varnish-cache.org/redhat/varnish-4.0.el7.rpm
     yum install varnish
 
-The --no-signature is only needed on initial installation, since
+The `--no-signature` argument is only needed on initial installation, since
 the Varnish GPG key is not yet in the yum keyring.
 
-Varnish Cache is also distributed in the EPEL (Extra Packages for
-Enterprise Linux) package repositories. However, while EPEL allows
-new versions to be distributed, it does not allow for
-backwards-incompatible changes. Therefore, new major versions will
-not hit EPEL and it is not necessarily up to date.
+
+External packaging
+------------------
+
+Varnish Cache is also distributed in third party package repositories.
+
+.. _`Fedora EPEL`: https://fedoraproject.org/wiki/EPEL
+
+* `Fedora EPEL`_ does community packaging of Varnish Cache.
+
+* RedHat has packaged versions of Varnish Cache available since Software Collections 2.1. Announcement on <http://developers.redhat.com/blog/2015/11/17/software-collections-2-1-generally-available/>.
+