diff --git a/src/Ursa.Themes.Semi/Controls/ThemeSelector.axaml b/src/Ursa.Themes.Semi/Controls/ThemeSelector.axaml
index 0b12693..228b4cb 100644
--- a/src/Ursa.Themes.Semi/Controls/ThemeSelector.axaml
+++ b/src/Ursa.Themes.Semi/Controls/ThemeSelector.axaml
@@ -7,6 +7,7 @@
             <ControlTemplate TargetType="u:ThemeToggleButton">
                 <Button
                     Padding="8"
+                    FontWeight="Regular"
                     Name="{x:Static u:ThemeToggleButton.PART_ThemeButton}"
                     HorizontalAlignment="Center"
                     Theme="{DynamicResource BorderlessButton}">
@@ -20,12 +21,15 @@
         </Setter>
         <Style Selector="^:dark /template/ PathIcon#PART_Icon">
             <Setter Property="Data" Value="{DynamicResource ThemeSelectorButtonDarkGlyph}"></Setter>
+            <Setter Property="ToolTip.Tip" Value="{DynamicResource STRING_THEME_TOGGLE_DARK}"></Setter>
         </Style>
         <Style Selector="^:light /template/ PathIcon#PART_Icon">
             <Setter Property="Data" Value="{DynamicResource ThemeSelectorButtonLightGlyph}"></Setter>
+            <Setter Property="ToolTip.Tip" Value="{DynamicResource STRING_THEME_TOGGLE_LIGHT}"></Setter>
         </Style>
         <Style Selector="^ /template/ PathIcon#PART_Icon">
             <Setter Property="Data" Value="{DynamicResource ThemeSelectorButtonDefaultGlyph}"></Setter>
+            <Setter Property="ToolTip.Tip" Value="{DynamicResource STRING_THEME_TOGGLE_SYSTEM}"></Setter>
         </Style>
     </ControlTheme>
 </ResourceDictionary>
diff --git a/src/Ursa.Themes.Semi/Locale/en-us.axaml b/src/Ursa.Themes.Semi/Locale/en-us.axaml
index 9940ce5..5ba89e2 100644
--- a/src/Ursa.Themes.Semi/Locale/en-us.axaml
+++ b/src/Ursa.Themes.Semi/Locale/en-us.axaml
@@ -12,4 +12,7 @@
     <x:String x:Key="STRING_MENU_DIALOG_CLOSE">Close</x:String>
     <x:String x:Key="STRING_PAGINATION_JUMP_TO">Jump to page</x:String>
     <x:String x:Key="STRING_PAGINATION_PAGE"> </x:String>
+    <x:String x:Key="STRING_THEME_TOGGLE_DARK">Dark</x:String>
+    <x:String x:Key="STRING_THEME_TOGGLE_LIGHT">Light</x:String>
+    <x:String x:Key="STRING_THEME_TOGGLE_SYSTEM">System</x:String>
 </ResourceDictionary>
diff --git a/src/Ursa.Themes.Semi/Locale/zh-cn.axaml b/src/Ursa.Themes.Semi/Locale/zh-cn.axaml
index d9a2c2b..2ffda25 100644
--- a/src/Ursa.Themes.Semi/Locale/zh-cn.axaml
+++ b/src/Ursa.Themes.Semi/Locale/zh-cn.axaml
@@ -12,4 +12,7 @@
     <x:String x:Key="STRING_MENU_DIALOG_CLOSE">关闭</x:String>
     <x:String x:Key="STRING_PAGINATION_JUMP_TO">跳至</x:String>
     <x:String x:Key="STRING_PAGINATION_PAGE">页</x:String>
+    <x:String x:Key="STRING_THEME_TOGGLE_DARK">暗色</x:String>
+    <x:String x:Key="STRING_THEME_TOGGLE_LIGHT">亮色</x:String>
+    <x:String x:Key="STRING_THEME_TOGGLE_SYSTEM">跟随系统</x:String>
 </ResourceDictionary>