diff --git a/src/algo_naive.c b/src/algo_naive.c
index b238efd..ecd6f55 100644
--- a/src/algo_naive.c
+++ b/src/algo_naive.c
@@ -168,6 +168,7 @@ void on_tcp_read(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
   printf("wil be forwarded to: %s\n", url);
   to_fdinfo = evt_core_get_from_url (ctx, url);
   if (to_fdinfo == NULL) goto co_error;
+  printf("A full UDP packet has been read from TCP\n");
 
   // 4. We move the buffer and notify the target
   mv_buffer_rtow (app_ctx, fdinfo, to_fdinfo, bp);
@@ -193,6 +194,7 @@ void on_tcp_write(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
     if (write_res == FDS_ERR) goto co_error;
   }
   if (bp->mode != BP_READING) return;
+  printf("A full UDP packet has been written to TCP\n");
 
   // 3. A whole packet has been written
   // Release the buffer and notify
@@ -220,6 +222,7 @@ void on_udp_read(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
   read_res = read_packet_from_udp (fdinfo->fd, bp);
   if (read_res == FDS_ERR) goto co_error;
   if (bp->mode != BP_WRITING) return;
+  printf("A full UDP packet has been read from UDP\n");
 
   // 3. A whole packet has been read, we will find someone to write it
   sprintf(url, "tcp:write:127.0.0.1:7500");
@@ -249,6 +252,7 @@ void on_udp_write (struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
   write_res = write_packet_to_udp(fdinfo->fd, bp);
   if (write_res == FDS_ERR) goto co_error;
   if (bp->mode != BP_READING) return;
+  printf("A full UDP packet has been written to UDP\n");
 
   // 3. A whole packet has been written
   // Release the buffer and notify