diff --git a/example/Vulkan/Deferred.cpp b/example/Vulkan/Deferred.cpp
index 664bc039..b6659944 100644
--- a/example/Vulkan/Deferred.cpp
+++ b/example/Vulkan/Deferred.cpp
@@ -107,7 +107,7 @@ private:
 
         gbuffer.subpass.desc.Add(desc);
 
-        device->CreateSubpassDependency(gbuffer.subpass.dependency,2);
+        device->CreateSubpassDependency(gbuffer.subpass.dependency,2);          //为啥要2个还不清楚
 
         gbuffer.renderpass=device->CreateRenderPass(gbuffer.attachment.desc_list,
                                                     gbuffer.subpass.desc,