diff --git a/net/tcp/tcp_recvwindow.c b/net/tcp/tcp_recvwindow.c
index 00083821ed..4411c50ff7 100644
--- a/net/tcp/tcp_recvwindow.c
+++ b/net/tcp/tcp_recvwindow.c
@@ -236,6 +236,10 @@ bool tcp_should_send_recvwindow(FAR struct tcp_conn_s *conn)
 
   if (win <= oldwin)
     {
+      ninfo("tcp_should_send_recvwindow: false: "
+            "rcvseq=%" PRIu32 ", rcv_adv=%" PRIu32 ", "
+            "old win=%" PRIu16 ", new win=%" PRIu16 "\n",
+            rcvseq, conn->rcv_adv, oldwin, win);
       return false;
     }
 
@@ -252,6 +256,9 @@ bool tcp_should_send_recvwindow(FAR struct tcp_conn_s *conn)
   maxwin = tcp_maxrcvwin(conn);
   if (2 * adv >= maxwin)
     {
+      ninfo("tcp_should_send_recvwindow: true: "
+            "adv=%" PRIu16 ", maxwin=%" PRIu16 "\n",
+            adv, maxwin);
       return true;
     }
 
@@ -262,8 +269,14 @@ bool tcp_should_send_recvwindow(FAR struct tcp_conn_s *conn)
   mss = tcp_rx_mss(dev);
   if (adv >= 2 * mss)
     {
+      ninfo("tcp_should_send_recvwindow: true: "
+            "adv=%" PRIu16 ", mss=%" PRIu16 ", maxwin=%" PRIu16 "\n",
+            adv, mss, maxwin);
       return true;
     }
 
+  ninfo("tcp_should_send_recvwindow: false: "
+        "adv=%" PRIu16 ", mss=%" PRIu16 ", maxwin=%" PRIu16 "\n",
+        adv, mss, maxwin);
   return false;
 }