diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
index 991f1cdc..65904f96 100644
--- a/src/core/tcp_in.c
+++ b/src/core/tcp_in.c
@@ -685,7 +685,7 @@ tcp_process(struct tcp_pcb *pcb)
     if (recv_flags & TF_GOT_FIN) {
       if ((flags & TCP_ACK) && (ackno == pcb->snd_nxt)) {
         LWIP_DEBUGF(TCP_DEBUG,
-          ("TCP connection closed %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+          ("TCP connection closed: FIN_WAIT_1 %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
         tcp_ack_now(pcb);
         tcp_pcb_purge(pcb);
         TCP_RMV(&tcp_active_pcbs, pcb);
@@ -702,7 +702,7 @@ tcp_process(struct tcp_pcb *pcb)
   case FIN_WAIT_2:
     tcp_receive(pcb);
     if (recv_flags & TF_GOT_FIN) {
-      LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+      LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: FIN_WAIT_2 %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
       tcp_ack_now(pcb);
       tcp_pcb_purge(pcb);
       TCP_RMV(&tcp_active_pcbs, pcb);
@@ -713,7 +713,7 @@ tcp_process(struct tcp_pcb *pcb)
   case CLOSING:
     tcp_receive(pcb);
     if (flags & TCP_ACK && ackno == pcb->snd_nxt) {
-      LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+      LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: CLOSING %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
       tcp_pcb_purge(pcb);
       TCP_RMV(&tcp_active_pcbs, pcb);
       pcb->state = TIME_WAIT;
@@ -723,7 +723,7 @@ tcp_process(struct tcp_pcb *pcb)
   case LAST_ACK:
     tcp_receive(pcb);
     if (flags & TCP_ACK && ackno == pcb->snd_nxt) {
-      LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+      LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: LAST_ACK %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
       /* bugfix #21699: don't set pcb->state to CLOSED here or we risk leaking segments */
       recv_flags |= TF_CLOSED;
     }