diff --git a/apps/voltmeter1/adc.c b/apps/voltmeter1/adc.c
index 0a81606..532a5e3 100644
--- a/apps/voltmeter1/adc.c
+++ b/apps/voltmeter1/adc.c
@@ -1,3 +1,8 @@
+/** @file   adc.c
+    @author M. P. Hayes, UCECE
+    @date   23 April 2013
+    @brief  Simple ADC using a comparator and RC network.
+*/
 #include "avr/io.h"
 #include "pio.h"
 #include "delay.h"
diff --git a/apps/voltmeter1/adc.h b/apps/voltmeter1/adc.h
index 2c305c4..5672670 100644
--- a/apps/voltmeter1/adc.h
+++ b/apps/voltmeter1/adc.h
@@ -1,3 +1,9 @@
+/** @file   adc.h
+    @author M. P. Hayes, UCECE
+    @date   23 April 2013
+    @brief  Simple ADC using a comparator and RC network.
+*/
+
 #ifndef ADC_H
 #define ADC_H