diff --git a/Marlin/src/HAL/HAL_AVR/servo_AVR.cpp b/Marlin/src/HAL/HAL_AVR/servo_AVR.cpp
index ab0a7ee61..81a1e8a5c 100644
--- a/Marlin/src/HAL/HAL_AVR/servo_AVR.cpp
+++ b/Marlin/src/HAL/HAL_AVR/servo_AVR.cpp
@@ -20,7 +20,6 @@
  *
  */
 
-
 /**
  * servo.cpp - Interrupt driven Servo library for Arduino using 16 bit timers- Version 2
  * Copyright (c) 2009 Michael Margolis.  All right reserved.
diff --git a/Marlin/src/HAL/HAL_AVR/spi_pins.h b/Marlin/src/HAL/HAL_AVR/spi_pins.h
index 444534880..9d67bad36 100644
--- a/Marlin/src/HAL/HAL_AVR/spi_pins.h
+++ b/Marlin/src/HAL/HAL_AVR/spi_pins.h
@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
diff --git a/Marlin/src/HAL/HAL_DUE/spi_pins.h b/Marlin/src/HAL/HAL_DUE/spi_pins.h
index 67414710b..9a04cddd3 100644
--- a/Marlin/src/HAL/HAL_DUE/spi_pins.h
+++ b/Marlin/src/HAL/HAL_DUE/spi_pins.h
@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -17,7 +20,6 @@
  *
  */
 
-
 #ifndef SPI_PINS_H_
 #define SPI_PINS_H_
 
diff --git a/Marlin/src/HAL/HAL_LPC1768/spi_pins.h b/Marlin/src/HAL/HAL_LPC1768/spi_pins.h
index f3997838a..866ea9ad1 100644
--- a/Marlin/src/HAL/HAL_LPC1768/spi_pins.h
+++ b/Marlin/src/HAL/HAL_LPC1768/spi_pins.h
@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -17,7 +20,6 @@
  *
  */
 
-
 #ifndef SPI_PINS_LPC1768_H
 #define SPI_PINS_LPC1768_H
 
diff --git a/Marlin/src/HAL/HAL_TEENSY35_36/spi_pins.h b/Marlin/src/HAL/HAL_TEENSY35_36/spi_pins.h
index 416fbf52f..a5e9d8e49 100644
--- a/Marlin/src/HAL/HAL_TEENSY35_36/spi_pins.h
+++ b/Marlin/src/HAL/HAL_TEENSY35_36/spi_pins.h
@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
diff --git a/Marlin/src/HAL/HAL_endstop_interrupts.h b/Marlin/src/HAL/HAL_endstop_interrupts.h
index ab0652ea7..eee6c5aca 100644
--- a/Marlin/src/HAL/HAL_endstop_interrupts.h
+++ b/Marlin/src/HAL/HAL_endstop_interrupts.h
@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -17,7 +20,6 @@
  *
  */
 
-
 #ifndef HAL_ENDSTOP_INTERRUPTS_H_
 #define HAL_ENDSTOP_INTERRUPTS_H_
 
diff --git a/Marlin/src/HAL/HAL_spi_pins.h b/Marlin/src/HAL/HAL_spi_pins.h
index 03607317b..05915d839 100644
--- a/Marlin/src/HAL/HAL_spi_pins.h
+++ b/Marlin/src/HAL/HAL_spi_pins.h
@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -17,7 +20,6 @@
  *
  */
 
-
 #ifndef HAL_SPI_PINS_H_
 #define HAL_SPI_PINS_H_
 
diff --git a/Marlin/src/HAL/I2cEeprom.cpp b/Marlin/src/HAL/I2cEeprom.cpp
index 8bdd00967..d5f6e6dd7 100644
--- a/Marlin/src/HAL/I2cEeprom.cpp
+++ b/Marlin/src/HAL/I2cEeprom.cpp
@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -17,7 +20,6 @@
  *
  */
 
-
 /**
  * Description: functions for I2C connected external EEPROM.
  * Not platform dependent.
diff --git a/Marlin/src/HAL/SpiEeprom.cpp b/Marlin/src/HAL/SpiEeprom.cpp
index 365d91d19..86d68fb3e 100644
--- a/Marlin/src/HAL/SpiEeprom.cpp
+++ b/Marlin/src/HAL/SpiEeprom.cpp
@@ -2,6 +2,9 @@
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
diff --git a/Marlin/src/HAL/servo.cpp b/Marlin/src/HAL/servo.cpp
index 0e8af8084..472117cd7 100644
--- a/Marlin/src/HAL/servo.cpp
+++ b/Marlin/src/HAL/servo.cpp
@@ -20,7 +20,6 @@
  *
  */
 
-
 /**
  * servo.cpp - Interrupt driven Servo library for Arduino using 16 bit timers- Version 2
  * Copyright (c) 2009 Michael Margolis.  All right reserved.