diff --git a/datacenter/dtr/2.1/guides/images/install-dtr-0.png b/datacenter/dtr/2.1/guides/images/install-dtr-0.png
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diff --git a/datacenter/dtr/2.1/guides/install/index.md b/datacenter/dtr/2.1/guides/install/index.md
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--- a/datacenter/dtr/2.1/guides/install/index.md
+++ b/datacenter/dtr/2.1/guides/install/index.md
@@ -22,7 +22,11 @@ Since DTR requires Docker Universal Control Plane (UCP)
 to run, you need to install UCP on all the nodes where you plan to install DTR.
 [Learn how to install UCP](/datacenter/ucp/2.0/guides/installation/index.md).
 
-Make sure all the nodes you plan on installing DTR are being managed by UCP.
+DTR needs to be installed on a worker node that is being managed by UCP.
+You can't install DTR on a standalone Docker Engine.
+
+![](../images/install-dtr-0.png)
+
 
 ## Step 3. Install DTR