--- a/src/ai/api/ai_marine.hpp	Tue Apr 08 11:07:17 2008 +0000
+++ b/src/ai/api/ai_marine.hpp	Tue Apr 08 11:54:53 2008 +0000
@@ -15,6 +15,9 @@
 public:
 	static const char *GetClassName() { return "AIMarine"; }
 
+	/**
+	 * All marine related error messages.
+	 */
 	enum ErrorMessages {
 		/** Base for marine related errors */
 		ERR_MARINE_BASE = AIError::ERR_CAT_MARINE << AIError::ERR_CAT_BIT_SIZE,

--- a/src/ai/api/ai_order.hpp	Tue Apr 08 11:07:17 2008 +0000
+++ b/src/ai/api/ai_order.hpp	Tue Apr 08 11:54:53 2008 +0000
@@ -15,6 +15,9 @@
 public:
 	static const char *GetClassName() { return "AIOrder"; }
 
+	/**
+	 * All order related error messages.
+	 */
 	enum ErrorMessages {
 		/** Base for all order related errors */
 		ERR_ORDER_BASE = AIError::ERR_CAT_ORDER << AIError::ERR_CAT_BIT_SIZE,

--- a/src/ai/api/ai_road.hpp	Tue Apr 08 11:07:17 2008 +0000
+++ b/src/ai/api/ai_road.hpp	Tue Apr 08 11:54:53 2008 +0000
@@ -15,6 +15,9 @@
 public:
 	static const char *GetClassName() { return "AIRoad"; }
 
+	/**
+	 * All road related error messages.
+	 */
 	enum ErrorMessages {
 		/** Base for road building / maintaining errors */
 		ERR_ROAD_BASE = AIError::ERR_CAT_ROAD << AIError::ERR_CAT_BIT_SIZE,

--- a/src/ai/api/ai_sign.hpp	Tue Apr 08 11:07:17 2008 +0000
+++ b/src/ai/api/ai_sign.hpp	Tue Apr 08 11:54:53 2008 +0000
@@ -15,6 +15,9 @@
 public:
 	static const char *GetClassName() { return "AISign"; }
 
+	/**
+	 * All sign related error messages.
+	 */
 	enum ErrorMessages {
 
 		/** Base for sign building related errors */

--- a/src/ai/api/ai_vehicle.hpp	Tue Apr 08 11:07:17 2008 +0000
+++ b/src/ai/api/ai_vehicle.hpp	Tue Apr 08 11:54:53 2008 +0000
@@ -16,6 +16,9 @@
 public:
 	static const char *GetClassName() { return "AIVehicle"; }
 
+	/**
+	 * All vehicle related error messages.
+	 */
 	enum ErrorMessages {
 		/** Base for vehicle related errors */
 		ERR_VEHICLE_BASE = AIError::ERR_CAT_VEHICLE << AIError::ERR_CAT_BIT_SIZE,