diff --git a/docs/images/billing.graphml b/docs/images/billing.graphml
index 1830135f..f2b34fb3 100644
--- a/docs/images/billing.graphml
+++ b/docs/images/billing.graphml
@@ -15,7 +15,6 @@
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     <data key="d0"/>
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       <data key="d6">
         <y:ShapeNode>
           <y:Geometry height="30.0" width="140.0" x="319.0" y="189.0"/>
@@ -33,7 +32,6 @@
       </data>
     </node>
     <node id="n1">
-      <data key="d5"/>
       <data key="d6">
         <y:ShapeNode>
           <y:Geometry height="30.0" width="140.0" x="319.0" y="239.0"/>
@@ -51,13 +49,12 @@
       </data>
     </node>
     <node id="n2">
-      <data key="d5"/>
       <data key="d6">
         <y:ShapeNode>
-          <y:Geometry height="30.0" width="140.0" x="319.0" y="289.0"/>
+          <y:Geometry height="30.0" width="140.0" x="319.0" y="342.0"/>
           <y:Fill color="#FFCC00" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="32.48828125" x="53.755859375" y="5.93359375">sudo<y:LabelModel>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="60.42578125" x="39.787109375" y="5.93359375">sudo:root<y:LabelModel>
               <y:SmartNodeLabelModel distance="4.0"/>
             </y:LabelModel>
             <y:ModelParameter>
@@ -69,13 +66,12 @@
       </data>
     </node>
     <node id="n3">
-      <data key="d5"/>
       <data key="d6">
         <y:ShapeNode>
-          <y:Geometry height="30.0" width="140.0" x="319.0" y="339.0"/>
+          <y:Geometry height="30.0" width="140.0" x="319.0" y="392.0"/>
           <y:Fill color="#FFCC00" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="71.423828125" x="34.2880859375" y="5.93359375">ssh:billing0<y:LabelModel>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="91.421875" x="24.2890625" y="5.93359375">docker:billing0<y:LabelModel>
               <y:SmartNodeLabelModel distance="4.0"/>
             </y:LabelModel>
             <y:ModelParameter>
@@ -87,10 +83,9 @@
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     </node>
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-      <data key="d5"/>
       <data key="d6">
         <y:ShapeNode>
-          <y:Geometry height="30.0" width="140.0" x="319.0" y="389.0"/>
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           <y:Fill color="#99CC00" transparent="false"/>
           <y:BorderStyle color="#000000" type="line" width="1.0"/>
           <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="131.740234375" x="4.1298828125" y="5.93359375">run-nightly-billing.py<y:LabelModel>
@@ -104,8 +99,24 @@
         </y:ShapeNode>
       </data>
     </node>
+    <node id="n5">
+      <data key="d6">
+        <y:ShapeNode>
+          <y:Geometry height="30.0" width="140.0" x="319.0" y="290.5"/>
+          <y:Fill color="#FFCC00" transparent="false"/>
+          <y:BorderStyle color="#000000" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="80.728515625" x="29.6357421875" y="5.93359375">ssh:docker-a<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+          <y:Shape type="rectangle"/>
+        </y:ShapeNode>
+      </data>
+    </node>
     <edge id="e0" source="n0" target="n1">
-      <data key="d9"/>
       <data key="d10">
         <y:PolyLineEdge>
           <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -115,8 +126,7 @@
         </y:PolyLineEdge>
       </data>
     </edge>
-    <edge id="e1" source="n1" target="n2">
-      <data key="d9"/>
+    <edge id="e1" source="n1" target="n5">
       <data key="d10">
         <y:PolyLineEdge>
           <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -127,7 +137,6 @@
       </data>
     </edge>
     <edge id="e2" source="n2" target="n3">
-      <data key="d9"/>
       <data key="d10">
         <y:PolyLineEdge>
           <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -138,6 +147,16 @@
       </data>
     </edge>
     <edge id="e3" source="n3" target="n4">
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e4" source="n5" target="n2">
       <data key="d9"/>
       <data key="d10">
         <y:PolyLineEdge>
diff --git a/docs/images/billing.png b/docs/images/billing.png
index a5dbf10d..f919acc3 100644
Binary files a/docs/images/billing.png and b/docs/images/billing.png differ
diff --git a/docs/index.rst b/docs/index.rst
index 215dc4d0..a2c9c9c1 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -95,15 +95,20 @@ to your network topology**.
         hostname='jump-box.mycorp.com'
     )
 
-    ssh_account = router.sudo(
+    docker_host = router.ssh(
         via=bastion_host,
+        hostname='docker-a.prod.mycorp.com'
+    )
+
+    sudo_account = router.sudo(
+        via=docker_host,
         username='user_with_magic_ssh_key',
         password='sudo password',
     )
 
-    internal_box = router.ssh(
-        via=ssh_account,
-        hostname='billing0.internal.mycorp.com'
+    internal_box = router.docker(
+        via=sudo_account,
+        container='billing0',
     )
 
     internal_box.call(os.system, './run-nightly-billing.py')