diff --git a/native/board_config.c b/native/board_config.c
index 317cdbb79e..dafdf747aa 100644
--- a/native/board_config.c
+++ b/native/board_config.c
@@ -1,12 +1,14 @@
 /**
  * Native Board config.h implementation
  *
+ * No functionality implemented at the moment.
+ *
  * Copyright (C) 2013 Ludwig Ortmann
  *
  * This file subject to the terms and conditions of the GNU General Public
  * License. See the file LICENSE in the top level directory for more details.
  *
- * @ingroup native
+ * @ingroup native_board
  * @{
  * @file
  * @author  Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
@@ -18,12 +20,18 @@
 
 #include <config.h>
 
+/**
+ * XXX: loading not implemented
+ */
 void config_load(void)
 {
     printf("XXX: config_load(): not implemented\n");
     return;
 }
 
+/**
+ * XXX: storing not implemented
+ */
 uint8_t config_save(void)
 {
     printf("XXX: config_save(): not implemented - your config will vanish on process termination\n");
diff --git a/native/board_init.c b/native/board_init.c
index 9a3266703e..d6f4c4ba31 100644
--- a/native/board_init.c
+++ b/native/board_init.c
@@ -6,7 +6,7 @@
  * This file subject to the terms and conditions of the GNU General Public
  * License. See the file LICENSE in the top level directory for more details.
  *
- * @ingroup native
+ * @ingroup native_board
  * @{
  * @file
  * @author  Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
@@ -15,6 +15,10 @@
 
 #include "board.h"
 
+/**
+ * Nothing to initialize at the moment.
+ * Turns the red LED on and the green LED off.
+ */
 void board_init()
 {
     LED_GREEN_OFF();
diff --git a/native/include/board.h b/native/include/board.h
index 71afb726ce..457289a566 100644
--- a/native/include/board.h
+++ b/native/include/board.h
@@ -1,12 +1,14 @@
 /**
  * Native Board interface
  *
+ * The native board uses call level hardware simulation.
+ *
  * Copyright (C) 2013 Ludwig Ortmann
  *
  * This file subject to the terms and conditions of the GNU General Public
  * License. See the file LICENSE in the top level directory for more details.
  *
- * @ingroup native
+ * @defgroup native_board
  * @{
  * @file
  * @author  Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
diff --git a/native/native-led.c b/native/native-led.c
index 2ee9d4979b..f2091c9a37 100644
--- a/native/native-led.c
+++ b/native/native-led.c
@@ -1,12 +1,14 @@
 /**
  * Native Board LED implementation
  *
+ * Only prints function calls at the moment.
+ *
  * Copyright (C) 2013 Ludwig Ortmann
  *
  * This file subject to the terms and conditions of the GNU General Public
  * License. See the file LICENSE in the top level directory for more details.
  *
- * @ingroup native
+ * @ingroup native_board
  * @{
  * @file
  * @author  Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
diff --git a/native/native-ltc4150.c b/native/native-ltc4150.c
index e18dee912d..99b4d0a3e5 100644
--- a/native/native-ltc4150.c
+++ b/native/native-ltc4150.c
@@ -1,16 +1,19 @@
 /**
  * Native Board ltc4150_arch.h implementation
  *
+ * Only measures time at the moment. Uses POSIX real-time extension
+ * timer to generate periodic signal/interrupt.
+ *
  * Copyright (C) 2013 Ludwig Ortmann
  *
  * This file subject to the terms and conditions of the GNU General Public
  * License. See the file LICENSE in the top level directory for more details.
  *
- * @ingroup native
+ * @ingroup native_board
+ * @ingroup ltc4150
  * @{
  * @file
  * @author  Ludwig Ortmann <ludwig.ortmann@fu-berlin.de>
- * @}
  */
 
 #include <stdio.h>
@@ -29,24 +32,36 @@
 static timer_t native_ltc4150_timer;
 static struct itimerspec native_ltc4150_timer_time;
 
+/**
+ * unregister signal handler
+ */
 void ltc4150_disable_int(void)
 {
     DEBUG("ltc4150_disable_int()\n");
     unregister_interrupt(_SIG_LTC4150);
 }
 
+/**
+ * register signal handler
+ */
 void ltc4150_enable_int(void)
 {
     DEBUG("ltc4150_enable_int()\n");
     register_interrupt(_SIG_LTC4150, ltc4150_interrupt);
 }
 
+/**
+ * elaborate nop
+ */
 void ltc4150_sync_blocking(void)
 {
     DEBUG("ltc4150_sync_blocking()\n");
     for(int i = native_ltc4150_startup_delay; i>0; i--);
 }
 
+/**
+ * set up posix real-time timer to simulate coloumb counter ticks
+ */
 void ltc4150_arch_init(void)
 {
     struct sigevent sev;
@@ -74,3 +89,4 @@ void ltc4150_arch_init(void)
 
     puts("Native LTC4150 initialized.");
 }
+/** @} */