diff --git a/tools/ei-demo-client.c b/tools/ei-demo-client.c
index 2b1e9ac..d7b8738 100644
--- a/tools/ei-demo-client.c
+++ b/tools/ei-demo-client.c
@@ -44,6 +44,7 @@
 #include <signal.h>
 #include <string.h>
 #include <stdarg.h>
+#include <inttypes.h>
 #include <linux/input-event-codes.h>
 
 #if HAVE_LIBXKBCOMMON
@@ -453,6 +454,7 @@ int main(int argc, char **argv)
 			uint64_t now = ei_now(ei);
 			uint64_t interval = ms2us(10); /* pretend events are 10ms apart */
 
+			colorprint("now: %" PRIu64 "\n", now);
 			if (have_ptr) {
 				colorprint("sending motion event\n");
 				ei_device_pointer_motion(ptr, -1, 1);
diff --git a/tools/eis-demo-server.c b/tools/eis-demo-server.c
index a5e337a..7e6af41 100644
--- a/tools/eis-demo-server.c
+++ b/tools/eis-demo-server.c
@@ -48,6 +48,7 @@
 #include <string.h>
 #include <sys/mman.h>
 #include <linux/input.h>
+#include <inttypes.h>
 
 #if HAVE_LIBXKBCOMMON
 #include <xkbcommon/xkbcommon.h>
@@ -476,7 +477,10 @@ eis_demo_server_printf_handle_event(struct eis_demo_server *server,
 		}
 		break;
 	case EIS_EVENT_FRAME:
-		/* nothing to do, we're not fancy enough to accumulate events properly */
+		{
+		colorprint("frame timestamp: %" PRIu64 "\n",
+			   eis_event_get_time(e));
+		}
 		break;
 	default:
 		abort();
@@ -620,6 +624,7 @@ int main(int argc, char **argv)
 
 		struct eis_demo_client *democlient;
 		uint64_t now = eis_now(eis);
+		colorprint("now: %" PRIu64 "\n", now);
 		const int interval = ms2us(12); /* events are 12ms apart */
 
 		list_for_each(democlient, &server.clients, link) {