diff --git a/apps/opencs/view/render/scenewidget.cpp b/apps/opencs/view/render/scenewidget.cpp
index e93bf347e..8f6b74765 100644
--- a/apps/opencs/view/render/scenewidget.cpp
+++ b/apps/opencs/view/render/scenewidget.cpp
@@ -58,9 +58,23 @@ namespace CSVRender
     {
         CSVWidget::SceneToolMode *tool = new CSVWidget::SceneToolMode (parent);
 
-        tool->addButton (":door.png", "day"); /// \todo replace icons
-        tool->addButton (":GMST.png", "night");
-        tool->addButton (":Info.png", "bright");
+        /// \todo replace icons
+        tool->addButton (":door.png", "day",
+            "Day"
+            "<ul><li>Cell specific ambient in interiors</li>"
+            "<li>Low ambient in exteriors</li>"
+            "<li>Strong directional light source/lir>"
+            "<li>This mode closely resembles day time in-game</li></ul>");
+        tool->addButton (":GMST.png", "night",
+            "Night"
+            "<ul><li>Cell specific ambient in interiors</li>"
+            "<li>Low ambient in exteriors</li>"
+            "<li>Weak directional light source</li>"
+            "<li>This mode closely resembles night time in-game</li></ul>");
+        tool->addButton (":Info.png", "bright",
+            "Bright"
+            "<ul><li>Maximum ambient</li>"
+            "<li>Strong directional light source</li></ul>");
 
         connect (tool, SIGNAL (modeChanged (const std::string&)),
             this, SLOT (selectLightingMode (const std::string&)));
diff --git a/apps/opencs/view/widget/scenetoolmode.cpp b/apps/opencs/view/widget/scenetoolmode.cpp
index 629cf9415..412959c7c 100644
--- a/apps/opencs/view/widget/scenetoolmode.cpp
+++ b/apps/opencs/view/widget/scenetoolmode.cpp
@@ -29,10 +29,11 @@ void CSVWidget::SceneToolMode::showPanel (const QPoint& position)
         mButtons.begin()->first->setFocus (Qt::OtherFocusReason);
 }
 
-void CSVWidget::SceneToolMode::addButton (const std::string& icon, const std::string& id)
+void CSVWidget::SceneToolMode::addButton (const std::string& icon, const std::string& id,
+    const std::string& tooltip)
 {
     PushButton *button = new PushButton (QIcon (QPixmap (icon.c_str())), PushButton::Type_Mode,
-        "", mPanel);
+        tooltip, mPanel);
     button->setSizePolicy (QSizePolicy (QSizePolicy::Fixed, QSizePolicy::Fixed));
     button->setIconSize (QSize (mIconSize, mIconSize));
     button->setFixedSize (mButtonSize, mButtonSize);
diff --git a/apps/opencs/view/widget/scenetoolmode.hpp b/apps/opencs/view/widget/scenetoolmode.hpp
index 0ad5243b3..5f18f712f 100644
--- a/apps/opencs/view/widget/scenetoolmode.hpp
+++ b/apps/opencs/view/widget/scenetoolmode.hpp
@@ -29,7 +29,8 @@ namespace CSVWidget
 
             virtual void showPanel (const QPoint& position);
 
-            void addButton (const std::string& icon, const std::string& id);
+            void addButton (const std::string& icon, const std::string& id,
+                const std::string& tooltip = "");
 
         signals: