diff --git a/src/core/tcp.c b/src/core/tcp.c
index e7281498..37348281 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -1782,7 +1782,6 @@ tcp_pcb_purge(struct tcp_pcb *pcb)
 }
 
 /**
- * @ingroup tcp_raw
  * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
  *
  * @param pcblist PCB list to purge.
diff --git a/src/include/lwip/tcp.h b/src/include/lwip/tcp.h
index 395692ac..0ae49a0f 100644
--- a/src/include/lwip/tcp.h
+++ b/src/include/lwip/tcp.h
@@ -359,8 +359,11 @@ void             tcp_err     (struct tcp_pcb *pcb, tcp_err_fn err);
 #define          tcp_mss(pcb)             (((pcb)->flags & TF_TIMESTAMP) ? ((pcb)->mss - 12)  : (pcb)->mss)
 #define          tcp_sndbuf(pcb)          (TCPWND16((pcb)->snd_buf))
 #define          tcp_sndqueuelen(pcb)     ((pcb)->snd_queuelen)
+/** @ingroup tcp_raw */
 #define          tcp_nagle_disable(pcb)   ((pcb)->flags |= TF_NODELAY)
+/** @ingroup tcp_raw */
 #define          tcp_nagle_enable(pcb)    ((pcb)->flags = (tcpflags_t)((pcb)->flags & ~TF_NODELAY))
+/** @ingroup tcp_raw */
 #define          tcp_nagle_disabled(pcb)  (((pcb)->flags & TF_NODELAY) != 0)
 
 #if TCP_LISTEN_BACKLOG
@@ -383,6 +386,7 @@ err_t            tcp_connect (struct tcp_pcb *pcb, const ip_addr_t *ipaddr,
                               u16_t port, tcp_connected_fn connected);
 
 struct tcp_pcb * tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog);
+/** @ingroup tcp_raw */
 #define          tcp_listen(pcb) tcp_listen_with_backlog(pcb, TCP_DEFAULT_LISTEN_BACKLOG)
 
 void             tcp_abort (struct tcp_pcb *pcb);