diff --git a/README.md b/README.md
index 32bb0b5..a183aa1 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,8 @@ Visual Studio Tools for AI works with both Visual Studio 2017 and 2015 on Window
 This extension is hosted on Visual Studio MarketPlace in two
 [VS 2017](https://marketplace.visualstudio.com/items?itemName=ms-toolsai.vstoolsai-vs2017),
 and [VS 2015](https://marketplace.visualstudio.com/items?itemName=ms-toolsai.vstoolsai-vs2015) packages.
+When downloading, the package file name may incorrectly end with **".zip"**.
+Please save it as **".vsix"** and then install locally.
 
 For the Visual Studio Code version please see [Visual Studio Code Tools for AI](http://aka.ms/vscodetoolsforai)
 
diff --git a/docs/installation.md b/docs/installation.md
index 271353a..ecbcb05 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -6,6 +6,8 @@ To install, download from the [Visual Studio MarketPlace](https://marketplace.vi
 Note this extension has both
 [VS 2017](https://marketplace.visualstudio.com/items?itemName=ms-toolsai.vstoolsai-vs2017),
 and [VS 2015](https://marketplace.visualstudio.com/items?itemName=ms-toolsai.vstoolsai-vs2015) packages.
+When downloading, the package file name may incorrectly end with **".zip"**.
+Please save it as **".vsix"** and then install locally.
 
 1. **Tools**> **Extensions and Updates**