Cleanup.

include/bgfx/bgfx.h

@@ -2823,14 +2823,16 @@ namespace bgfx
 		, uint16_t _depth = UINT16_MAX
 		);
 
-	/// Request screen shot.
+	/// Request screen shot of window back buffer.
 	///
-	/// @param[in] _handle Frame buffer handle.
+	/// @param[in] _handle Frame buffer handle. If handle is `BGFX_INVALID_HANDLE` request will be
+	///   made for main window back buffer.
 	/// @param[in] _filePath Will be passed to `bgfx::CallbackI::screenShot` callback.
 	///
 	/// @remarks
 	///   `bgfx::CallbackI::screenShot` must be implemented.
 	///
+	/// @attention Frame buffer handle must be created with OS' target native window handle.
 	/// @attention C99 equivalent is `bgfx_request_screen_shot`.
 	///
 	void requestScreenShot(FrameBufferHandle _handle, const char* _filePath);