diff --git a/headers/os/drivers/USB_spec.h b/headers/os/drivers/USB_spec.h
index d21306c8d7..7f5d5bfdad 100644
--- a/headers/os/drivers/USB_spec.h
+++ b/headers/os/drivers/USB_spec.h
@@ -60,6 +60,14 @@ extern "C" {
 #define USB_FEATURE_DEVICE_REMOTE_WAKEUP	1
 #define USB_FEATURE_ENDPOINT_HALT			0
 
+#define USB_ENDPOINT_ATTR_CONTROL		0x00
+#define USB_ENDPOINT_ATTR_ISOCHRONOUS	0x01
+#define USB_ENDPOINT_ATTR_BULK		0x02 
+#define USB_ENDPOINT_ATTR_INTERRUPT	0x03 
+#define USB_ENDPOINT_ATTR_MASK		0x03 
+
+#define USB_ENDPOINT_ADDR_DIR_IN	 	0x80
+#define USB_ENDPOINT_ADDR_DIR_OUT		0x00
 
 
 typedef struct {