diff --git a/example/Vulkan/VKCommandBuffer.h b/example/Vulkan/VKCommandBuffer.h
index c7c673e5..5c2dce59 100644
--- a/example/Vulkan/VKCommandBuffer.h
+++ b/example/Vulkan/VKCommandBuffer.h
@@ -41,6 +41,8 @@ public:
         clear_values[1].depthStencil.stencil=s;
     }
 
+    //以上设定在Begin开始后即不可改变
+
     bool Begin(RenderPass *rp,Framebuffer *fb);
     bool Bind(Pipeline *p);
     bool Bind(PipelineLayout *pl);