diff --git a/src/lib66/utils/scandir_send_signal.c b/src/lib66/utils/scandir_send_signal.c
index de636d5deb7ad88e9f0a2365ee29d769dd2298db..5b44660d9325d1edb33e1c54708cb32f5cd8ecd5 100644
--- a/src/lib66/utils/scandir_send_signal.c
+++ b/src/lib66/utils/scandir_send_signal.c
@@ -31,6 +31,7 @@ int scandir_send_signal(char const *scandir,char const *signal)
     for (; datalen < idlen ; datalen++)
         data[datalen] = signal[datalen] ;
 
+    log_trace("send signal: ", signal, " to scandir: ", scandir) ;
     switch (s6_svc_writectl(scandir, S6_SVSCAN_CTLDIR, data, datalen))
     {
         case -1: log_warnusys("control: ", scandir) ;