diff --git a/cubesatsim/cubesatsim.h b/cubesatsim/cubesatsim.h
index 0fed2585..47c27f9a 100644
--- a/cubesatsim/cubesatsim.h
+++ b/cubesatsim/cubesatsim.h
@@ -215,6 +215,7 @@ bool TimerHandler1(struct repeating_timer *t);
 void load_sstv_image_1_as_cam_dot_jpg(); 
 void load_sstv_image_2_as_cam_dot_jpg();
 void get_input();
+void transmit_led(bool status);
 
 #ifndef STASSID
 #define STASSID "Pico"