Merge pull request progit#233 from austerus/master

Installing Git: asciidoc, docbook2x & xmlto progit#227

Author: ben

book/01-introduction/sections/installing.asc

@@ -61,14 +61,20 @@ Some people may instead find it useful to install Git from source, because you'l
 The binary installers tend to be a bit behind, though as Git has matured in recent years, this has made less of a difference.
 
 If you do want to install Git from source, you need to have the following libraries that Git depends on: curl, zlib, openssl, expat, and libiconv.
-For example, if you're on a system that has yum (such as Fedora) or apt-get (such as a Debian based system), you can use one of these commands to install all of the dependencies:
+For example, if you're on a system that has yum (such as Fedora) or apt-get (such as a Debian based system), you can use one of these commands to install the minimal dependencies for compiling and installing the Git binaries:
 
   $ yum install curl-devel expat-devel gettext-devel \
     openssl-devel zlib-devel
 
   $ apt-get install libcurl4-gnutls-dev libexpat1-dev gettext \
     libz-dev libssl-dev
 
+In order to be able to add the documentation in various formats (doc, html, info), these additional dependencies are required:
+
+  $ yum install asciidoc xmlto docbook2x
+
+  $ apt-get install asciidoc xmlto docbook2x
+
 When you have all the necessary dependencies, you can go ahead and grab the latest tagged release tarball from several places.
 You can get it via the Kernel.org site, at https://www.kernel.org/pub/software/scm/git[], or the mirror on the GitHub web site, at https://github.com/git/git/releases[].
 It's generally a little clearer what the latest version is on the GitHub page, but the kernel.org page also has release signatures if you want to verify your download.