Add login to private docker registry.
diff --git a/README.rst b/README.rst
index 111fa88..b2bf63e 100644
--- a/README.rst
+++ b/README.rst
@@ -86,6 +86,23 @@
               to:
                 - name@receivehost.com
 
+Docker login to private registry
+--------------------------------
+
+.. code-block:: yaml
+
+    docker:
+      host:
+        enabled: true
+        registry:
+          first:
+            address: private.docker.com
+            user: username
+            password: password
+          second:
+            address: private2.docker.com
+            user: username2
+            password: password2
 
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