diff --git a/grbl/cpu_map.h b/grbl/cpu_map.h
index 8623fdc..1781795 100644
--- a/grbl/cpu_map.h
+++ b/grbl/cpu_map.h
@@ -18,8 +18,9 @@
   along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-/* The cpu_map.h file serves as a central pin mapping settings file for different processor
-   types, i.e. AVR 328p or AVR Mega 2560. Grbl officially supports the Arduino Uno, but the 
+/* The cpu_map.h file serves as a central pin mapping selection file for different processor
+   types, i.e. AVR 328p or AVR Mega 2560. Each processor has its own pin mapping file.
+   (i.e. cpu_map_atmega328p.h)  Grbl officially supports the Arduino Uno, but the 
    other supplied pin mappings are supplied by users, so your results may vary. */
 
 // NOTE: This is still a work in progress. We are still centralizing the configurations to
diff --git a/grbl/cpu_map_atmega2560.h b/grbl/cpu_map_atmega2560.h
index 1c1ef39..b8a0aa2 100644
--- a/grbl/cpu_map_atmega2560.h
+++ b/grbl/cpu_map_atmega2560.h
@@ -1,3 +1,25 @@
+/*
+  cpu_map_atmega2560.h - CPU and pin mapping configuration file
+  Part of Grbl
+
+  Copyright (c) 2012-2015 Sungeun K. Jeon
+
+  Grbl 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
+  (at your option) any later version.
+
+  Grbl is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* This cpu_map file serves as a central pin mapping settings file for AVR Mega 2560 */
+
 #ifdef GRBL_PLATFORM
 #error "cpu_map already defined: GRBL_PLATFORM=" GRBL_PLATFORM
 #endif
diff --git a/grbl/cpu_map_atmega328p.h b/grbl/cpu_map_atmega328p.h
index 5d38011..8bb071d 100644
--- a/grbl/cpu_map_atmega328p.h
+++ b/grbl/cpu_map_atmega328p.h
@@ -1,3 +1,27 @@
+/*
+  cpu_map_atmega328p.h - CPU and pin mapping configuration file
+  Part of Grbl
+
+  Copyright (c) 2012-2015 Sungeun K. Jeon
+
+  Grbl 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
+  (at your option) any later version.
+
+  Grbl is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* This cpu_map file serves as a central pin mapping settings file for AVR 328p 
+   used on the Arduino Uno */
+
+
 #ifdef GRBL_PLATFORM
 #error "cpu_map already defined: GRBL_PLATFORM=" GRBL_PLATFORM
 #endif