diff --git a/src/cheat/CheatCodeDialog.cxx b/src/cheat/CheatCodeDialog.cxx
index 09ac1cd3c..481dcbcd5 100644
--- a/src/cheat/CheatCodeDialog.cxx
+++ b/src/cheat/CheatCodeDialog.cxx
@@ -100,6 +100,7 @@ CheatCodeDialog::CheatCodeDialog(OSystem& osystem, DialogContainer& parent,
     return (c >= 'a' && c <= 'f') || (c >= '0' && c <= '9');
   };
   myCheatInput->setTextFilter(f1, 1);
+  myCheatInput->setToolTip("See Stella documentation for details.", 1);
 
   addToFocusList(wid);
 
diff --git a/src/gui/EmulationDialog.cxx b/src/gui/EmulationDialog.cxx
index dcbb42859..a2c0bee9c 100644
--- a/src/gui/EmulationDialog.cxx
+++ b/src/gui/EmulationDialog.cxx
@@ -99,6 +99,7 @@ EmulationDialog::EmulationDialog(OSystem& osystem, DialogContainer& parent,
 
   // Use sync to vblank
   myUseVSync = new CheckboxWidget(this, _font, xpos, ypos + 1, "VSync");
+  myUseVSync->setToolTip("Check to enable vertical synced display updates.");
   wid.push_back(myUseVSync);
   ypos += lineHeight + VGAP;
 
diff --git a/src/gui/EventMappingWidget.cxx b/src/gui/EventMappingWidget.cxx
index 8051e4a56..7b3ae540b 100644
--- a/src/gui/EventMappingWidget.cxx
+++ b/src/gui/EventMappingWidget.cxx
@@ -97,6 +97,7 @@ EventMappingWidget::EventMappingWidget(GuiObject* boss, const GUI::Font& font,
   myCancelMapButton = new ButtonWidget(boss, font, xpos, ypos,
                                        buttonWidth, buttonHeight,
                                        "Cancel", kStopMapCmd);
+  myCancelMapButton->setToolTip("Cancel current mapping.");
   myCancelMapButton->setTarget(this);
   myCancelMapButton->clearFlags(Widget::FLAG_ENABLED);
   addFocusWidget(myCancelMapButton);
@@ -106,12 +107,14 @@ EventMappingWidget::EventMappingWidget(GuiObject* boss, const GUI::Font& font,
                                    buttonWidth, buttonHeight,
                                    "Erase", kEraseCmd);
   myEraseButton->setTarget(this);
+  myEraseButton->setToolTip("Erase any mapping for selected event.");
   addFocusWidget(myEraseButton);
 
   ypos += buttonHeight + VGAP;
   myResetButton = new ButtonWidget(boss, font, xpos, ypos,
                                    buttonWidth, buttonHeight,
                                    "Reset", kResetCmd);
+  myResetButton->setToolTip("Reset mapping for selected event to defaults.");
   myResetButton->setTarget(this);
   addFocusWidget(myResetButton);
 
diff --git a/src/gui/UIDialog.cxx b/src/gui/UIDialog.cxx
index 12f710bc0..2d773b888 100644
--- a/src/gui/UIDialog.cxx
+++ b/src/gui/UIDialog.cxx
@@ -109,6 +109,8 @@ UIDialog::UIDialog(OSystem& osystem, DialogContainer& parent,
   xpos = myDialogFontPopup->getRight() + fontWidth * 5;
   myHidpiWidget = new CheckboxWidget(myTab, font, xpos,
                                      ypos + 1, "HiDPI mode (*)");
+  myHidpiWidget->setToolTip("Scale the UI by a factor of two when enabled.");
+
   wid.push_back(myHidpiWidget);
 
   // Dialog position
@@ -126,6 +128,7 @@ UIDialog::UIDialog(OSystem& osystem, DialogContainer& parent,
   // Center window (in windowed mode)
   xpos = myHidpiWidget->getLeft();
   myCenter = new CheckboxWidget(myTab, _font, xpos, ypos + 1, "Center windows");
+  myCenter->setToolTip("Check to center all windows, else remember last position.");
   wid.push_back(myCenter);
 
   // Delay between quick-selecting characters in ListWidget
@@ -138,6 +141,8 @@ UIDialog::UIDialog(OSystem& osystem, DialogContainer& parent,
   myListDelaySlider->setMaxValue(1000);
   myListDelaySlider->setStepValue(50);
   myListDelaySlider->setTickmarkIntervals(5);
+  myListDelaySlider->setToolTip("Set delay between key presses in file lists"
+                                " before a search string resets.");
   wid.push_back(myListDelaySlider);
   ypos += lineHeight + VGAP;