Update README.md

Add comment about not using zip file for downloading

Update README.md
Add comment about not using zip file for downloading
1d0d3024 · Don Gagne · 8ccf64f0 · 1d0d3024
Commit 1d0d3024 authored Jan 02, 2016 by Don Gagne
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@@ -22,7 +22,7 @@ Source code for QGroundControl is kept on GitHub: https://github.com/mavlink/qgr
 ```
 git clone --recursive https://github.com/mavlink/qgroundcontrol.git
 ```
-Each time you pull new source to your repository you should run `git submodule update` to get the latest submodules as well.
+Each time you pull new source to your repository you should run `git submodule update` to get the latest submodules as well. Since QGroundControl uses submodules, using the zip file for source download will not work. You must use git.

 ### Supported Builds
 QGroundControl builds are supported for OSX, Linux, Windows and Android. QGroundControl uses [Qt](http://www.qt.io) as it's cross-platform support library and uses [QtCreator](http://doc.qt.io/qtcreator/index.html) as it's default build environment.