diff --git a/tinyusb/class/cdc_host.h b/tinyusb/class/cdc_host.h
index 786eeb20..11746c37 100644
--- a/tinyusb/class/cdc_host.h
+++ b/tinyusb/class/cdc_host.h
@@ -87,7 +87,7 @@ void tusbh_cdc_xfer_isr(uint8_t dev_addr, tusb_event_t event, cdc_pipeid_t pipe_
 //--------------------------------------------------------------------+
 // RNDIS APPLICATION API
 //--------------------------------------------------------------------+
-/** \defgroup CDC_RNDIS Remote Network Driver Interface Specification (RNDIS)
+/** \addtogroup CDC_RNDIS Remote Network Driver Interface Specification (RNDIS)
  *  @{ */
 bool tusbh_cdc_rndis_is_mounted(uint8_t dev_addr) ATTR_PURE ATTR_WARN_UNUSED_RESULT;
 tusb_error_t tusbh_cdc_rndis_get_mac_addr(uint8_t dev_addr, uint8_t mac_address[6]);
diff --git a/tinyusb/class/cdc_rndis.h b/tinyusb/class/cdc_rndis.h
index 334f6145..20c21758 100644
--- a/tinyusb/class/cdc_rndis.h
+++ b/tinyusb/class/cdc_rndis.h
@@ -36,10 +36,9 @@
 */
 /**************************************************************************/
 
-/** \ingroup TBD
- *  \defgroup TBD
- *  \brief TBD
- *
+/** \addtogroup CDC_RNDIS Remote Network Driver Interface Specification (RNDIS)
+ *  @{
+ *  \defgroup CDC_RNDIS_Common Common Definitions
  *  @{
  */
 
@@ -272,3 +271,4 @@ typedef struct {
 #endif /* _TUSB_CDC_RNDIS_H_ */
 
 /** @} */
+/** @} */