diff --git a/RIOT/examples/network_app_rtt/main.c b/RIOT/examples/network_app_rtt/main.c
index 4dddee1..9079ac2 100755
--- a/RIOT/examples/network_app_rtt/main.c
+++ b/RIOT/examples/network_app_rtt/main.c
@@ -101,7 +101,7 @@ uint32_t start, end;
 uint32_t time1, time2;
 char rbuf[MAXLEN], sbuf[MAXLEN], ack[MAXLEN];
 
-// calculate the time diff between start and end
+// calculate the time diff between start and end (in ms)
 float delay(uint32_t t1, uint32_t t2)
 {
 	float d;
--
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