update

docs/developer-guide/vulkan-driver-loader.md

@@ -15,6 +15,16 @@ net.load_param("model.param");
 net.load_param("model.bin");
 ```
 
+Using the in-house vulkan loader instead of the standard libvulkan has the following benefits
+
+1. Can compile ncnn vulkan code without installing vulkan-sdk
+2. Can deploy and distribute applications without libvulkan linkage
+3. Can load external vulkan driver instead of system driver
+4. Can directly load android hal module
+5. Can directly load graphics card driver files via NCNN_VULKAN_DRIVER env
+6. Able to actively search for graphics card driver files in the system and load them
+7. Can compile android libraries supporting vulkan under the platform of android-api<24
+
 ## Create and manage gpu context
 
 ```cpp