update doc for docker image (#353)

* update doc for docker image * update
microsoft · Nov 12, 2018 · 35e0832 · 35e0832
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diff --git a/deployment/docker/README.md b/deployment/docker/README.md
@@ -30,4 +30,7 @@ __Run the docker image__
 or
 ```
     docker run --runtime=nvidia -it nni/nni
-```
+```
+
+## 3.Directly retrieve the docker image
+If you do not want to build docker image, you can retrieve the NNI docker image from Docker Hub through the command `docker pull msranni/nni:latest`.
diff --git a/docs/InstallNNI_Ubuntu.md b/docs/InstallNNI_Ubuntu.md
@@ -22,7 +22,7 @@
 
 * __Install NNI in docker image__
 
-    You can also install NNI in a docker image. Please follow the instructions [here](../deployment/docker/README.md) to build NNI docker image.
+    You can also install NNI in a docker image. Please follow the instructions [here](../deployment/docker/README.md) to build NNI docker image. The NNI docker image can also be retrieved from Docker Hub through the command `docker pull msranni/nni:latest`.
 
 ## Further reading
 * [Overview](Overview.md)