diff --git a/README.md b/README.md
index dc4c8cb421f500ef170027b3469ab2666d5c88cd..1b86e305d65c94473f058602a2fea8fee7a8b1c8 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ QGroundControl builds are supported for OSX, Linux, Windows and Android. QGround
 #### Install QT
 You need to install Qt like this instead of using packages from say a Linux distribution because QGroundControl needs access to private Qt headers.
 * Download the [Qt installer](http://www.qt.io/download-open-source)
-    * Ubuntu: Set the downloaded file to executable using:`chmod +x`. Install to default location for use with ./qgroundcontrol-start.sh
+    * Ubuntu: Set the downloaded file to executable using:`chmod +x`. Install to default location for use with ./qgroundcontrol-start.sh. If you install Qt to a non-default location you will need to modify qgroundcontrol-start.sh in order to run downloaded builds.
     * Windows: Default installer not quite correct, use [this](http://download.qt.io/official_releases/qt/5.5/5.5.1/qt-opensource-windows-x86-msvc2013-5.5.1.exe) instead