diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index 5c8ed2e8e5..52a9099964 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -46,6 +46,12 @@ namespace Qt {
         transparent
     };
 
+    enum class Appearance {
+        Unknown = 0x0000,
+        Light   = 0x0001,
+        Dark    = 0x0002
+    };
+
     enum MouseButton {
         NoButton         = 0x00000000,
         LeftButton       = 0x00000001,
@@ -1745,6 +1751,7 @@ namespace Qt {
     Q_ENUM_NS(DayOfWeek)
     Q_ENUM_NS(CursorShape)
     Q_ENUM_NS(GlobalColor)
+    Q_ENUM_NS(Appearance)
     Q_ENUM_NS(AspectRatioMode)
     Q_ENUM_NS(TransformationMode)
     Q_FLAG_NS(ImageConversionFlags)
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index 23e3e9736b..22092a2dae 100644
--- a/src/corelib/global/qnamespace.qdoc
+++ b/src/corelib/global/qnamespace.qdoc
@@ -788,6 +788,17 @@
     \sa QDockWidget::setAllowedAreas, QDockWidget::isAreaAllowed
 */
 
+/*!
+    \enum Qt::Appearance
+
+    Represents the appearance of an application's theme,
+    defined by QGuiApplication::palette().
+
+    \value Unknown The appearance is unknown.
+    \value Light The background colors are lighter than the text color, i.e. the theme is light.
+    \value Dark The background colors are darker than the text color, i.e. the theme is dark.
+*/
+
 /*!
     \enum Qt::ImageConversionFlag