diff --git a/pdu_power_sequence.ino b/pdu_power_sequence.ino
index 94a1cfa..4fdbf3d 100644
--- a/pdu_power_sequence.ino
+++ b/pdu_power_sequence.ino
@@ -1,6 +1,7 @@
 #include <avr/interrupt.h>
 #include <avr/sleep.h>
 
+// Set to "1" to enable debug output, 0 (or else) disables serial output
 #define DEBUG 1
 
 #if DEBUG == 1