diff --git a/tools/Makefile b/tools/Makefile
index 8498370..9437a63 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -1,8 +1,9 @@
 #
-# Various OSC tools
+# Various OSC (and UDP) tools
 #
 
 # https://git.tetalab.org/tTh/gadgets-OSC
 
 udp-dumper:	udp-dumper.c Makefile
 	gcc -Wall $< -o $@
+
diff --git a/tools/udp-dumper.c b/tools/udp-dumper.c
index 3f41ec5..cf76a76 100644
--- a/tools/udp-dumper.c
+++ b/tools/udp-dumper.c
@@ -45,6 +45,8 @@ long			serial;
 double			starttime, curtime;
 struct timeval		tp;
 
+fprintf(stderr, "%s: listen on port %d\n", __func__, port);
+
 if (-1==(sock=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))) {
 	perror("socket fail ");
 	exit(1);
@@ -77,11 +79,12 @@ do	{
 	if (verbosity) {
 		gettimeofday(&tp, NULL);
 		curtime = tp.tv_sec + tp.tv_usec / 1e6;
-		printf("----+ %5d b    ts: %.3f\n", foo, curtime - starttime);
+		printf("----+ %4ld %5d b    ts: %.3f\n",
+				serial, foo, curtime - starttime);
 		}
 		
 	for (bar=0; bar<=foo; bar+=16) {
-		printf("%3ld | ", serial);
+		printf("%3ld | ", bar);
 		dumpln(buffer+bar);
 		} 
 	serial++;