Optional installation source - pip

source:engine metadata created - defaults to pkg
installation, pip installation alternative added
diff --git a/README.rst b/README.rst
index ec4f666..f63aa65 100644
--- a/README.rst
+++ b/README.rst
@@ -45,6 +45,18 @@
         minions:
         - name: 'node1.system.location.domain.com'
 
+Salt master with alternative installation source and version (optional) - pip
+
+.. code-block:: yaml
+
+    salt:
+      master:
+        enabled: true
+        ...
+        source:
+          engine: pip
+          version: 2016.3.0rc2
+
 Salt master syndicate master of masters
 
 .. code-block:: yaml
@@ -216,4 +228,4 @@
               image: ubuntu-14-04-x64-1456128611.qcow2
               size: medium
               disk_profile: database
-              net_profile: testing
\ No newline at end of file
+              net_profile: testing