-This includes a Yocto/OpenEmbedded compatible layer meta-oran and wrapper scripts
-to pull all required Yocto/OE layers to build out the reference platform.
+* Currently the following OS are supported:
+
+ * Debian 11 (bullseye)
+ * CentOS 7
+ * Yocto 2.7 (warrior)
+
+Notes:
+ * Debian based is the recommended platfrom.
+ * The intended audiences of this guide are the developers who want to develop/integrate apps in INF platform, if you just want to install and deploy INF platform, you can ignore this guide and read the `INF Installation Guide`_
+
+.. _`INF Installation Guide`: https://docs.o-ran-sc.org/projects/o-ran-sc-pti-rtp/en/latest/installation-guide.html
+
+1.1 About the Debian based implementaion
+----------------------------------------
+The project provde wrapper scripts to automate all the steps of `StarlingX Debian Build Guide`_ to build out the reference platform as an installable ISO image.
+
+.. _`StarlingX Debian Build Guide`: https://wiki.openstack.org/wiki/StarlingX/DebianBuildEnvironment
+
+1.2 About the CentOS based implementaion
+----------------------------------------
+The project provde wrapper scripts to automate all the steps of `StarlingX Build Guide`_ to build out the reference platform as an installable ISO image.
+
+.. _`StarlingX Build Guide`: https://docs.starlingx.io/developer_resources/build_guide.html
+
+1.3 About the Yocto based implementation
+----------------------------------------
+
+The project provde wrapper scripts to pull all required Yocto/OE layers to build out the reference platform as an installable ISO image.