--- 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 */