diff --git a/README.markdown b/README.markdown
index a46a26de894..b1a1f91771a 100644
--- a/README.markdown
+++ b/README.markdown
@@ -18,3 +18,25 @@ cd home-assistant.io
 bundle
 rake preview
 ```
+
+
+### Preparation on CentOS
+On CentOS (here 7.1.1503) Ruby is not available by default. Please take the notes here as a little guide for the Ruby installation process. 
+
+```bash
+curl -sSL https://rvm.io/mpapis.asc | gpg2 --import -
+curl -L get.rvm.io | bash -s stable
+source ~/.profile
+rvm requirements
+rvm install ruby-2.2.2
+rvm use ruby-2.2.2 --default
+ruby -v
+```
+
+The last command will give you something like this `ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]`. Then install `bundler`.
+
+```bash
+gem install bundler
+```
+
+Now please follow the instruction above.