diff --git a/src/plugins/debugger/debuggerprofileconfigwidget.cpp b/src/plugins/debugger/debuggerprofileconfigwidget.cpp
index 2c6a903766b..cc8fa70ee42 100644
--- a/src/plugins/debugger/debuggerprofileconfigwidget.cpp
+++ b/src/plugins/debugger/debuggerprofileconfigwidget.cpp
@@ -67,6 +67,8 @@ DebuggerProfileConfigWidget::DebuggerProfileConfigWidget(ProjectExplorer::Profil
     m_info(pi),
     m_chooser(new Utils::PathChooser)
 {
+    setToolTip(tr("The debugger to use for this target."));
+
     QVBoxLayout *layout = new QVBoxLayout(this);
     layout->setMargin(0);
 
diff --git a/src/plugins/projectexplorer/profileinformationconfigwidget.cpp b/src/plugins/projectexplorer/profileinformationconfigwidget.cpp
index 90ef43b0afd..c354b6f8866 100644
--- a/src/plugins/projectexplorer/profileinformationconfigwidget.cpp
+++ b/src/plugins/projectexplorer/profileinformationconfigwidget.cpp
@@ -59,6 +59,8 @@ SysRootInformationConfigWidget::SysRootInformationConfigWidget(Profile *p, QWidg
     ProfileConfigWidget(parent),
     m_profile(p)
 {
+    setToolTip(tr("The root directory of the system image to use.<br>"
+                  "Leave empty when building for the desktop."));
     QHBoxLayout *layout = new QHBoxLayout(this);
     layout->setMargin(0);
     m_chooser = new Utils::PathChooser;
@@ -110,6 +112,9 @@ ToolChainInformationConfigWidget::ToolChainInformationConfigWidget(Profile *p, Q
     m_isReadOnly(false), m_profile(p),
     m_comboBox(new QComboBox), m_manageButton(new QPushButton(this))
 {
+    setToolTip(tr("The tool chain to use for building.<br>"
+                  "Make sure the tool chains will produce binaries compatible with the target device, "
+                  "Qt version and other libraries used."));
     ToolChainManager *tcm = ToolChainManager::instance();
 
     QHBoxLayout *layout = new QHBoxLayout(this);
@@ -235,6 +240,7 @@ DeviceTypeInformationConfigWidget::DeviceTypeInformationConfigWidget(Profile *p,
     m_isReadOnly(false), m_profile(p),
     m_comboBox(new QComboBox)
 {
+    setToolTip(tr("The type of device to run applications on."));
     QHBoxLayout *layout = new QHBoxLayout(this);
     layout->setMargin(0);
     m_comboBox->setContentsMargins(0, 0, 0, 0);
@@ -302,6 +308,8 @@ DeviceInformationConfigWidget::DeviceInformationConfigWidget(Profile *p, QWidget
     m_comboBox(new QComboBox), m_manageButton(new QPushButton(this)),
     m_model(new DeviceManagerModel(DeviceManager::instance()))
 {
+    setToolTip(tr("The device to run the applications on."));
+
     QHBoxLayout *layout = new QHBoxLayout(this);
     layout->setMargin(0);
     m_comboBox->setContentsMargins(0, 0, 0, 0);
diff --git a/src/plugins/projectexplorer/profilemanagerconfigwidget.cpp b/src/plugins/projectexplorer/profilemanagerconfigwidget.cpp
index 72d7693b983..5fe8c0d46c3 100644
--- a/src/plugins/projectexplorer/profilemanagerconfigwidget.cpp
+++ b/src/plugins/projectexplorer/profilemanagerconfigwidget.cpp
@@ -126,11 +126,18 @@ void ProfileManagerConfigWidget::addConfigWidget(ProjectExplorer::ProfileConfigW
 
     connect(widget, SIGNAL(dirty()), this, SIGNAL(dirty()));
     int row = m_layout->rowCount();
-    m_layout->addWidget(new QLabel(widget->displayName()), row, 0,
+    QLabel *label = new QLabel(widget->displayName());
+    label->setToolTip(widget->toolTip());
+    m_layout->addWidget(label, row, 0,
                         Qt::Alignment(style()->styleHint(QStyle::SH_FormLayoutLabelAlignment)));
     m_layout->addWidget(widget, row, 1);
-    if (widget->buttonWidget())
+    QWidget *buttonWidget = widget->buttonWidget();
+    if (buttonWidget) {
+        if (buttonWidget->toolTip().isEmpty())
+            buttonWidget->setToolTip(widget->toolTip());
         m_layout->addWidget(widget->buttonWidget(), row, 2);
+    }
+
     m_widgets.append(widget);
 }
 
diff --git a/src/plugins/projectexplorer/profilemanagerconfigwidget.h b/src/plugins/projectexplorer/profilemanagerconfigwidget.h
index 36ed444ae7b..62bacb26f5e 100644
--- a/src/plugins/projectexplorer/profilemanagerconfigwidget.h
+++ b/src/plugins/projectexplorer/profilemanagerconfigwidget.h
@@ -49,7 +49,7 @@ class ProfileManagerConfigWidget : public ProjectExplorer::ProfileConfigWidget
     Q_OBJECT
 
 public:
-    ProfileManagerConfigWidget(Profile *p, QWidget *parent = 0);
+    explicit ProfileManagerConfigWidget(Profile *p, QWidget *parent = 0);
 
     QString displayName() const;
 
diff --git a/src/plugins/qt4projectmanager/qmakeprofileconfigwidget.cpp b/src/plugins/qt4projectmanager/qmakeprofileconfigwidget.cpp
index 40bd08a648d..64adc6ef2d9 100644
--- a/src/plugins/qt4projectmanager/qmakeprofileconfigwidget.cpp
+++ b/src/plugins/qt4projectmanager/qmakeprofileconfigwidget.cpp
@@ -48,6 +48,8 @@ QmakeProfileConfigWidget::QmakeProfileConfigWidget(ProjectExplorer::Profile *p,
     m_profile(p),
     m_lineEdit(new QLineEdit)
 {
+    setToolTip(tr("The mkspec to use when building the project with qmake.<br>"
+                  "This setting is ignored when using other build systems."));
     QHBoxLayout *layout = new QHBoxLayout(this);
     layout->setMargin(0);
 
diff --git a/src/plugins/qt4projectmanager/qmakeprofileconfigwidget.h b/src/plugins/qt4projectmanager/qmakeprofileconfigwidget.h
index 4ff400bb77d..32c3ad429c8 100644
--- a/src/plugins/qt4projectmanager/qmakeprofileconfigwidget.h
+++ b/src/plugins/qt4projectmanager/qmakeprofileconfigwidget.h
@@ -47,7 +47,7 @@ class QmakeProfileConfigWidget : public ProjectExplorer::ProfileConfigWidget
     Q_OBJECT
 
 public:
-    QmakeProfileConfigWidget(ProjectExplorer::Profile *p, QWidget *parent = 0);
+    explicit QmakeProfileConfigWidget(ProjectExplorer::Profile *p, QWidget *parent = 0);
 
     QString displayName() const;
 
diff --git a/src/plugins/qtsupport/qtprofileconfigwidget.cpp b/src/plugins/qtsupport/qtprofileconfigwidget.cpp
index d610b5775f5..d488bb31e0f 100644
--- a/src/plugins/qtsupport/qtprofileconfigwidget.cpp
+++ b/src/plugins/qtsupport/qtprofileconfigwidget.cpp
@@ -53,6 +53,8 @@ QtProfileConfigWidget::QtProfileConfigWidget(ProjectExplorer::Profile *p,
     m_combo(new QComboBox),
     m_manageButton(new QPushButton(this))
 {
+    setToolTip(tr("The Qt library to use for all projects using this profile.<br>"
+                  "A Qt version is required for qmake-based projects and optional when using other build systems."));
     QHBoxLayout *layout = new QHBoxLayout(this);
     layout->setMargin(0);
 
diff --git a/src/plugins/qtsupport/qtprofileconfigwidget.h b/src/plugins/qtsupport/qtprofileconfigwidget.h
index ee3c1e50593..2a0becdafe5 100644
--- a/src/plugins/qtsupport/qtprofileconfigwidget.h
+++ b/src/plugins/qtsupport/qtprofileconfigwidget.h
@@ -48,7 +48,7 @@ class QtProfileConfigWidget : public ProjectExplorer::ProfileConfigWidget
     Q_OBJECT
 
 public:
-    QtProfileConfigWidget(ProjectExplorer::Profile *p, QWidget *parent = 0);
+    explicit QtProfileConfigWidget(ProjectExplorer::Profile *p, QWidget *parent = 0);
 
     QString displayName() const;