diff --git a/xos/hpc_observer/hpc_watcher.py b/xos/hpc_observer/hpc_watcher.py
index c6224a6..5b9f181 100644
--- a/xos/hpc_observer/hpc_watcher.py
+++ b/xos/hpc_observer/hpc_watcher.py
@@ -12,6 +12,10 @@
 
          resource_name should be set to the domain name to lookup.
 
+         result_contains is option and can be used to hold "A", "CNAME", or
+            a particular address or hostname that should be contained in the
+            query's answer.
+
        kind="http": checks the hpc nodes to make sure that a URL can be
          retrieved from the node.