diff --git a/src/api/netifapi.c b/src/api/netifapi.c
index 6261569d..2c246802 100644
--- a/src/api/netifapi.c
+++ b/src/api/netifapi.c
@@ -31,6 +31,12 @@
  *
  */
 
+/**
+ * @defgroup netifapi Thread-safe API
+ * @ingroup netif
+ * Thread-safe functions to be called from non-TCPIP threads
+ */
+
 #include "lwip/opt.h"
 
 #if LWIP_NETIF_API /* don't build if not configured for use in lwipopts.h */
@@ -108,6 +114,7 @@ netifapi_do_netif_common(struct tcpip_api_call_data *m)
 }
 
 /**
+ * @ingroup netifapi
  * Call netif_add() in a thread-safe way by running that function inside the
  * tcpip_thread context.
  *
@@ -152,6 +159,7 @@ netifapi_netif_add(struct netif *netif,
 
 #if LWIP_IPV4
 /**
+ * @ingroup netifapi
  * Call netif_set_addr() in a thread-safe way by running that function inside the
  * tcpip_thread context.
  *
diff --git a/src/core/dns.c b/src/core/dns.c
index b04dbd75..5ee482ce 100644
--- a/src/core/dns.c
+++ b/src/core/dns.c
@@ -60,6 +60,8 @@
  * must be implemented by the module that uses the resolver).
  * 
  * All functions must be called from TCPIP thread.
+ * 
+ * @see @ref netconn_dns
  */
 
 /*-----------------------------------------------------------------------------
diff --git a/src/core/tcp.c b/src/core/tcp.c
index 6a1f9149..e7281498 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -40,7 +40,7 @@
  * @defgroup tcp_raw TCP
  * @ingroup raw_api
  * Transmission Control Protocol for IP\n
- * @see @ref raw_api
+ * @see @ref raw_api and @ref netconn
  *
  * Common functions for the TCP implementation, such as functinos
  * for manipulating the data structures and the TCP timer functions. TCP functions
diff --git a/src/core/udp.c b/src/core/udp.c
index da5e7c8d..14130ab3 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -40,7 +40,7 @@
  * @defgroup udp_raw UDP
  * @ingroup raw_api
  * User Datagram Protocol module\n
- * @see @ref raw_api
+ * @see @ref raw_api and @ref netconn
  */
 
 /* udp.c
diff --git a/src/include/lwip/netifapi.h b/src/include/lwip/netifapi.h
index 0071f921..b9f8104d 100644
--- a/src/include/lwip/netifapi.h
+++ b/src/include/lwip/netifapi.h
@@ -92,15 +92,21 @@ err_t netifapi_netif_set_addr(struct netif *netif, const ip4_addr_t *ipaddr,
 err_t netifapi_netif_common(struct netif *netif, netifapi_void_fn voidfunc,
                             netifapi_errt_fn errtfunc);
 
+/** @ingroup netifapi */
 #define netifapi_netif_remove(n)      netifapi_netif_common(n, netif_remove, NULL)
+/** @ingroup netifapi */
 #define netifapi_netif_set_up(n)      netifapi_netif_common(n, netif_set_up, NULL)
+/** @ingroup netifapi */
 #define netifapi_netif_set_down(n)    netifapi_netif_common(n, netif_set_down, NULL)
+/** @ingroup netifapi */
 #define netifapi_netif_set_default(n) netifapi_netif_common(n, netif_set_default, NULL)
+
 #define netifapi_dhcp_start(n)        netifapi_netif_common(n, NULL, dhcp_start)
 #define netifapi_dhcp_stop(n)         netifapi_netif_common(n, dhcp_stop, NULL)
 #define netifapi_dhcp_inform(n)       netifapi_netif_common(n, dhcp_inform, NULL)
 #define netifapi_dhcp_renew(n)        netifapi_netif_common(n, NULL, dhcp_renew)
 #define netifapi_dhcp_release(n)      netifapi_netif_common(n, NULL, dhcp_release)
+
 #define netifapi_autoip_start(n)      netifapi_netif_common(n, NULL, autoip_start)
 #define netifapi_autoip_stop(n)       netifapi_netif_common(n, NULL, autoip_stop)