Added credentials and nodes existence testing.
diff --git a/README.rst b/README.rst
index 896a95b..319e0b7 100644
--- a/README.rst
+++ b/README.rst
@@ -349,7 +349,9 @@
               num_executors: 1
               node_mode: Normal
               ret_strategy: Always
-              label: example_label
+              labels:
+                - example
+                - label
               launcher:
                  type: jnlp
 
@@ -366,7 +368,9 @@
               num_executors: 1
               node_mode: Normal
               ret_strategy: Always
-              label: example_label
+              labels:
+                - example
+                - label 
               launcher:
                  type: ssh
                  host: test-launcher