diff --git a/src/core/tcp.c b/src/core/tcp.c
index 9289f7f4..c8e23186 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -1428,6 +1428,7 @@ tcp_seg_free(struct tcp_seg *seg)
 }
 
 /**
+ * @ingroup tcp
  * Sets the priority of a connection.
  *
  * @param pcb the tcp_pcb to manipulate
diff --git a/src/include/lwip/tcp.h b/src/include/lwip/tcp.h
index deedaf98..29f89fd8 100644
--- a/src/include/lwip/tcp.h
+++ b/src/include/lwip/tcp.h
@@ -349,9 +349,12 @@ void             tcp_poll    (struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interv
 #if LWIP_TCP_TIMESTAMPS
 #define          tcp_mss(pcb)             (((pcb)->flags & TF_TIMESTAMP) ? ((pcb)->mss - 12)  : (pcb)->mss)
 #else /* LWIP_TCP_TIMESTAMPS */
+/** @ingroup tcp_raw */
 #define          tcp_mss(pcb)             ((pcb)->mss)
 #endif /* LWIP_TCP_TIMESTAMPS */
+/** @ingroup tcp_raw */
 #define          tcp_sndbuf(pcb)          (TCPWND16((pcb)->snd_buf))
+/** @ingroup tcp_raw */
 #define          tcp_sndqueuelen(pcb)     ((pcb)->snd_queuelen)
 /** @ingroup tcp_raw */
 #define          tcp_nagle_disable(pcb)   ((pcb)->flags |= TF_NODELAY)