diff --git a/src/max44000/max44000.cxx b/src/max44000/max44000.cxx
index d755a760..447b3892 100644
--- a/src/max44000/max44000.cxx
+++ b/src/max44000/max44000.cxx
@@ -64,7 +64,7 @@ MAX44000::getProximity () {
 uint16_t
 MAX44000::getAmbient () {
     uint16_t data = 0;
-    
+
     data = (i2cReadReg_8 (ALSDATA_HIGH) & 0x7F) << 8;
     data = data | i2cReadReg_8 (ALSDATA_LOW);
 
diff --git a/src/max44000/max44000.h b/src/max44000/max44000.h
index d2d4ff72..23f00c54 100644
--- a/src/max44000/max44000.h
+++ b/src/max44000/max44000.h
@@ -102,8 +102,26 @@ class MAX44000 {
             return m_name;
         }
 
+        /**
+         * Read one byte register
+         *
+         * @param reg address of a register
+         */
         uint8_t i2cReadReg_8 (int reg);
+
+        /**
+         * Read two bytes register
+         *
+         * @param reg address of a register
+         */
         uint16_t i2cReadReg_16 (int reg);
+
+        /**
+         * Write to one byte register
+         *
+         * @param reg address of a register
+         * @param value byte to be written
+         */
         maa_result_t i2cWriteReg (uint8_t reg, uint8_t value);
 
     private: