diff --git a/APMrover2/test.cpp b/APMrover2/test.cpp
index d50174c582..21063fcd4c 100644
--- a/APMrover2/test.cpp
+++ b/APMrover2/test.cpp
@@ -52,7 +52,7 @@ int8_t Rover::test_radio_pwm(uint8_t argc, const Menu::arg *argv)
 	while(1){
 		delay(20);
 
-		// Filters radio input - adjust filters in the radio.pde file
+		// Filters radio input - adjust filters in the radio.cpp file
 		// ----------------------------------------------------------
 		read_radio();