diff --git a/README.md b/README.md
index c59cd23..2f7b05c 100644
--- a/README.md
+++ b/README.md
@@ -33,9 +33,12 @@ iface usb0 inet static
       netmask 255.255.255.0
 ```         
 
-## Update the Kernel
+## Update the Kernel（ os image before v0.3 )
 Download the Kernel image:
 
 https://github.com/clockworkpi/Kernel/raw/master/uImage
 
 To the first partition of the micro SD card.
+
+## in v0.3 or later os image,usb network is already included
+