diff -r 8db93a3a29dc -r 88b31fdc760b QTfrontend/ui/page/pagedata.cpp
--- a/QTfrontend/ui/page/pagedata.cpp	Wed Apr 12 22:04:32 2017 +0200
+++ b/QTfrontend/ui/page/pagedata.cpp	Wed Apr 12 23:05:18 2017 +0200
@@ -61,6 +61,7 @@
 
     pbOpenDir = addButton(tr("Open packages directory"), bottomLayout, 2, false, Qt::AlignBottom);
     pbOpenDir->setStyleSheet("padding: 5px 10px");
+    pbOpenDir->setWhatsThis(tr("Open the directory in which the downloaded files are stored in your system"));
     pbOpenDir->setMinimumHeight(50);
 
     bottomLayout->setStretch(2, 1);