diff --git a/libraries/AP_PID/examples/AP_pid/AP_pid.pde b/libraries/AP_PID/examples/AP_pid/AP_pid.pde
index 5d7cf59df4..9ce0bfcc02 100644
--- a/libraries/AP_PID/examples/AP_pid/AP_pid.pde
+++ b/libraries/AP_PID/examples/AP_pid/AP_pid.pde
@@ -1,51 +1,51 @@
-/*
-	Example of PID library.
-	2010 Code by Jason Short. DIYDrones.com
-*/
-
-#include <Arduino_Mega_ISR_Registry.h>
-#include <FastSerial.h>
-#include <AP_Common.h>
-#include <APM_RC.h> // ArduPilot RC Library
-#include <AP_PID.h> // ArduPilot Mega RC Library
-
-long radio_in;
-long radio_trim;
-
-Arduino_Mega_ISR_Registry isr_registry;
-AP_PID pid;
-APM_RC_APM1 APM_RC;
-
-void setup()
-{
-	Serial.begin(115200);
-	Serial.println("ArduPilot Mega AP_PID library test");
-
-	isr_registry.init();
-	APM_RC.Init(&isr_registry);	 // APM Radio initialization
-
-	delay(1000);
-	//rc.trim();
-	radio_trim = APM_RC.InputCh(0);
-
-	pid.kP(1);
-	pid.kI(0);
-	pid.kD(0.5);
-	pid.imax(50);
-	pid.kP(0);
-	pid.kI(0);
-	pid.kD(0);
-	pid.imax(0);
-	Serial.printf("P %f  I %f  D %f  imax %f\n", pid.kP(), pid.kI(), pid.kD(), pid.imax());
-}
-
-void loop()
-{
-	delay(20);
-	//rc.read_pwm();
-	long error 		= APM_RC.InputCh(0) - radio_trim;
-	long control 	= pid.get_pid(error, 20, 1);
-
-	Serial.print("control: ");
-	Serial.println(control,DEC);
-}
+/*
+ *       Example of PID library.
+ *       2010 Code by Jason Short. DIYDrones.com
+ */
+
+#include <Arduino_Mega_ISR_Registry.h>
+#include <FastSerial.h>
+#include <AP_Common.h>
+#include <APM_RC.h> // ArduPilot RC Library
+#include <AP_PID.h> // ArduPilot Mega RC Library
+
+long radio_in;
+long radio_trim;
+
+Arduino_Mega_ISR_Registry isr_registry;
+AP_PID pid;
+APM_RC_APM1 APM_RC;
+
+void setup()
+{
+    Serial.begin(115200);
+    Serial.println("ArduPilot Mega AP_PID library test");
+
+    isr_registry.init();
+    APM_RC.Init(&isr_registry);          // APM Radio initialization
+
+    delay(1000);
+    //rc.trim();
+    radio_trim = APM_RC.InputCh(0);
+
+    pid.kP(1);
+    pid.kI(0);
+    pid.kD(0.5);
+    pid.imax(50);
+    pid.kP(0);
+    pid.kI(0);
+    pid.kD(0);
+    pid.imax(0);
+    Serial.printf("P %f  I %f  D %f  imax %f\n", pid.kP(), pid.kI(), pid.kD(), pid.imax());
+}
+
+void loop()
+{
+    delay(20);
+    //rc.read_pwm();
+    long error              = APM_RC.InputCh(0) - radio_trim;
+    long control    = pid.get_pid(error, 20, 1);
+
+    Serial.print("control: ");
+    Serial.println(control,DEC);
+}