diff --git a/libraries/MySensors/core/MyMessage.h b/libraries/MySensors/core/MyMessage.h
index c84494a..f9c2a29 100644
--- a/libraries/MySensors/core/MyMessage.h
+++ b/libraries/MySensors/core/MyMessage.h
@@ -24,7 +24,7 @@
  * @defgroup MyMessagegrp MyMessage
  * @{
  *
- * @brief Here you can find all message types used my the MySensors protocol as well as macros for
+ * @brief Here you can find all message types used by the MySensors protocol as well as macros for
  * parsing and manipulating messages.
  */
 #ifndef MyMessage_h
@@ -36,18 +36,18 @@
 #include <stdint.h>
 #endif
 
-#define PROTOCOL_VERSION 2
-#define MAX_MESSAGE_LENGTH 32
-#define HEADER_SIZE 7
-#define MAX_PAYLOAD (MAX_MESSAGE_LENGTH - HEADER_SIZE)
+#define PROTOCOL_VERSION 2    //!< The version of the protocol
+#define MAX_MESSAGE_LENGTH 32 //!< The maximum size of a message (including header)
+#define HEADER_SIZE 7         //!< The size of the header
+#define MAX_PAYLOAD (MAX_MESSAGE_LENGTH - HEADER_SIZE) //!< The maximum size of a payload depends on #MAX_MESSAGE_LENGTH and #HEADER_SIZE
 
-// Message types
+/// @brief The command field (message-type) defines the overall properties of a message
 typedef enum {
-	C_PRESENTATION = 0,
-	C_SET = 1,
-	C_REQ = 2,
-	C_INTERNAL = 3,
-	C_STREAM = 4 // For Firmware and other larger chunks of data that need to be divided into pieces.
+	C_PRESENTATION = 0, //!< Sent by a node when they present attached sensors. This is usually done in presentation() at startup.
+	C_SET = 1, //!< This message is sent from or to a sensor when a sensor value should be updated.
+	C_REQ = 2, //!< Requests a variable value (usually from an actuator destined for controller).
+	C_INTERNAL = 3, //!< Internal MySensors messages (also include common messages provided/generated by the library).
+	C_STREAM = 4 //!< For firmware and other larger chunks of data that need to be divided into pieces.
 } mysensor_command;
 
 // Type of sensor (used when presenting sensors)