Update README.md

README.md

@@ -3,7 +3,7 @@ Opencaching.de Code Repository
 
 [Opencaching.de](http://www.opencaching.de) is a major Geocaching website in Germany.
 This repository contains the website's code, including all third-party libraries
-needed to run it. It is one two major Opencaching code forks; the other one is
+needed to run it. It is one of two major Opencaching code forks; the other one is
 [Opencaching.pl](http://code.google.com/p/opencaching-pl/).
 
 Feel free to use it under the provided
@@ -11,17 +11,18 @@ Feel free to use it under the provided
 for setting up your own open and free Geocaching listing service! Your contributions
 to this project are welcome - you may contact the team in the
 [Opencaching network forum](http://forum.opencaching-network.org/) if you like to
-join us.
+join us. Development is done on a VirtualBox Linux system that you can run on your
+Linux, Windows or Mac workstation.
 
 This repo contains three major branches:
 * the *stable* branch with current Opencaching.de production code
 * the *master* branch, basis of all development, which contains code that will be released with the next site update
 * the *next* branch with experimental features to be tested.
 
-The 'next' branch is now and then hard-resetted to the master branch and rebuilt from there,
+The *next* branch is now and then hard-resetted to the master branch and rebuilt from there,
 so do not derive any working-branches from it. Use master instead.
 
-Major OC.de site updates are version-tagged. See the [changelog](www.opencaching.de/articles.php?page=changelog&locale=EN)
+Major OC.de site updates are version-tagged. See the [changelog](http://www.opencaching.de/articles.php?page=changelog&locale=EN)
 for a detailed list.
 
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