diff --git a/usbDesc.h b/usbDesc.h
index 5cc2140..0b598cd 100644
--- a/usbDesc.h
+++ b/usbDesc.h
@@ -1,3 +1,17 @@
+enum USB_bDescriptorType {
+    DESCRIPTOR_DEVICE = 0x1,
+    DESCRIPTOR_CONFIGURATION = 0x2,
+    DESCRIPTOR_CONFIGURATION = 0x4,
+    DESCRIPTOR_ENDPOINT = 0x5
+};
+
+enum USB_Type_BCD {
+    USB20 = 0x0200,
+    USB11 = 0x0110,
+    USB10 = 0x0100
+};
+
+
 
 enum USB_PID {
     // Token Packets