diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/README.md b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/README.md
new file mode 100644
index 000000000..b0109ef6a
--- /dev/null
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/README.md
@@ -0,0 +1,3 @@
+USB3.0: xhci dwc3
+USB2.0: ehci dwc2
+USB1.1: ohci uhci