diff --git a/include/Pomdog/Platform/Cocoa/Bootstrap.hpp b/include/Pomdog/Platform/Cocoa/Bootstrap.hpp
index 780bdd4e9..f840ff913 100755
--- a/include/Pomdog/Platform/Cocoa/Bootstrap.hpp
+++ b/include/Pomdog/Platform/Cocoa/Bootstrap.hpp
@@ -27,18 +27,25 @@ namespace Pomdog::Cocoa {
 
 class POMDOG_EXPORT Bootstrap final {
 public:
+    /// Sets the window where the video is drawn.
     void SetWindow(NSWindow* window);
 
+    /// Sets to true if OpenGL is enabled, false if Metal is enabled. false by default.
     void SetOpenGLEnabled(bool enabled);
 
+    /// Sets the format of the back buffer when using the OpenGL renderer.
     void SetOpenGLSurfaceFormat(SurfaceFormat surfaceFormat);
 
+    /// Sets the format of the depth stencil buffer when using the OpenGL renderer.
     void SetOpenGLDepthFormat(DepthFormat depthFormat);
 
+    /// Sets an error event handler to a log stream.
     void OnError(std::function<void(const std::exception&)>&& onError);
 
+    /// Sets an completion event handler to a log stream.
     void OnCompleted(std::function<void()>&& onCompleted);
 
+    /// Begins running a game loop.
     void Run(std::function<std::shared_ptr<Game>(const std::shared_ptr<GameHost>&)>&& createGame);
 
 private:
diff --git a/include/Pomdog/Platform/Win32/Bootstrap.hpp b/include/Pomdog/Platform/Win32/Bootstrap.hpp
index d478f2aff..3852c8b71 100644
--- a/include/Pomdog/Platform/Win32/Bootstrap.hpp
+++ b/include/Pomdog/Platform/Win32/Bootstrap.hpp
@@ -10,38 +10,49 @@
 #include <memory>
 
 namespace Pomdog {
-
 class Game;
 class GameHost;
+} // namespace Pomdog
 
-namespace Win32 {
+namespace Pomdog::Win32 {
 
-class POMDOG_EXPORT Bootstrap {
+class POMDOG_EXPORT Bootstrap final {
 public:
+    /// Sets the instance handle.
     void SetInstance(HINSTANCE hInstance) noexcept;
 
+    /// Sets the WinMain function's `nCmdShow` parameter.
     void SetCommandShow(int cmdShow) noexcept;
 
+    /// Sets a window's icon.
     void SetIcon(HICON icon) noexcept;
 
+    /// Sets a window's small icon.
     void SetIconSmall(HICON iconSmall) noexcept;
 
+    /// Sets the format of the back buffer.
     void SetSurfaceFormat(SurfaceFormat surfaceFormat) noexcept;
 
+    /// Sets the format of the depth stencil buffer.
     void SetDepthFormat(DepthFormat depthFormat) noexcept;
 
+    /// Sets the maximum rate at which the back buffers can be presented. 60 by default.
     void SetPresentationInterval(int presentationInterval) noexcept;
 
+    /// Sets the size of the swap chain, in pixels.
     void SetBackBufferSize(int width, int height) noexcept;
 
+    /// Sets to true if the window is in full screen mode, false if it is window mode. false by default.
     void SetFullScreen(bool isFullScreen) noexcept;
 
-    void SetOpenGLEnabled(bool openGLEnabled) noexcept;
+    /// Sets to true if OpenGL is enabled, false if Direct3D is enabled. false by default.
+    void SetOpenGLEnabled(bool enabled) noexcept;
 
+    /// Sets an error event handler to a log stream.
     void OnError(std::function<void(const std::exception&)> onError);
 
-    void Run(
-        const std::function<std::unique_ptr<Game>(const std::shared_ptr<GameHost>&)>& createApp);
+    /// Begins running a game loop.
+    void Run(const std::function<std::unique_ptr<Game>(const std::shared_ptr<GameHost>&)>& createGame);
 
 private:
     std::function<void(const std::exception&)> onError;
@@ -58,5 +69,4 @@ class POMDOG_EXPORT Bootstrap {
     bool openGLEnabled = false;
 };
 
-} // namespace Win32
-} // namespace Pomdog
+} // namespace Pomdog::Win32
diff --git a/include/Pomdog/Platform/X11/Bootstrap.hpp b/include/Pomdog/Platform/X11/Bootstrap.hpp
index 1e5b5b3cc..f8cf94224 100644
--- a/include/Pomdog/Platform/X11/Bootstrap.hpp
+++ b/include/Pomdog/Platform/X11/Bootstrap.hpp
@@ -9,30 +9,37 @@
 #include <memory>
 
 namespace Pomdog {
-
 class Game;
 class GameHost;
+} // namespace Pomdog
 
-namespace X11 {
+namespace Pomdog::X11 {
 
-class POMDOG_EXPORT Bootstrap {
+class POMDOG_EXPORT Bootstrap final {
 public:
+    /// Sets the format of the back buffer.
     void SetSurfaceFormat(SurfaceFormat surfaceFormat) noexcept;
 
+    /// Sets the format of the depth stencil buffer.
     void SetDepthFormat(DepthFormat depthFormat) noexcept;
 
+    /// Sets the maximum rate at which the back buffers can be presented. 60 by default.
     void SetPresentationInterval(int presentationInterval) noexcept;
 
+    /// Sets the size of the swap chain, in pixels.
     void SetBackBufferSize(int width, int height) noexcept;
 
+    /// Sets to true if the window is in full screen mode, false if it is window mode. false by default.
     void SetFullScreen(bool isFullScreen) noexcept;
 
-    void SetOpenGLEnabled(bool openGLEnabled) noexcept;
+    /// Sets to true if OpenGL is enabled, false if Direct3D is enabled. false by default.
+    void SetOpenGLEnabled(bool enabled) noexcept;
 
+    /// Sets an error event handler to a log stream.
     void OnError(std::function<void(const std::exception&)> onError);
 
-    void Run(
-        const std::function<std::unique_ptr<Game>(const std::shared_ptr<GameHost>&)>& createApp);
+    /// Begins running a game loop.
+    void Run(const std::function<std::unique_ptr<Game>(const std::shared_ptr<GameHost>&)>& createGame);
 
 private:
     std::function<void(const std::exception&)> onError;
@@ -44,5 +51,4 @@ class POMDOG_EXPORT Bootstrap {
     bool isFullScreen = false;
 };
 
-} // namespace X11
-} // namespace Pomdog
+} // namespace Pomdog::X11