diff --git a/wordclock/wordclock.ino b/wordclock/wordclock.ino
index 70c67de..a202054 100644
--- a/wordclock/wordclock.ino
+++ b/wordclock/wordclock.ino
@@ -730,13 +730,13 @@ static int uart_thread(struct pt *pt)
 							{
 							case 'c':
 								// get current value
-								Serial.print("I: c: ");
+								Serial.print("G: Ic: ");
 								Serial.println(lightlevel_sample,
 									DEC);
 								break;
 							case 'a':
 								// get average
-								Serial.print("I: a: ");
+								Serial.print("G: Ia: ");
 								Serial.println(lightlevel_avg,
 									DEC);
 								break;