diff -r f9a4f4d11c3a -r 92b3b0fcb41f QTfrontend/ui/page/pagemultiplayer.cpp
--- a/QTfrontend/ui/page/pagemultiplayer.cpp	Fri May 06 15:45:48 2016 +0200
+++ b/QTfrontend/ui/page/pagemultiplayer.cpp	Fri May 06 16:08:48 2016 +0200
@@ -60,6 +60,7 @@
     QSize sz = lp.actualSize(QSize(65535, 65535));
     BtnStartMPGame = new QPushButton();
     BtnStartMPGame->setText(tr("Start"));
+    BtnStartMPGame->setWhatsThis(tr("Start fighting (requires at least 2 teams)"));
     BtnStartMPGame->setMinimumWidth(sz.width() + 60);
     BtnStartMPGame->setIcon(lp);
     BtnStartMPGame->setFixedHeight(50);