--- a/src/ai/api/ai_sign.hpp	Mon Mar 31 07:50:27 2008 +0000
+++ b/src/ai/api/ai_sign.hpp	Mon Mar 31 08:42:20 2008 +0000
@@ -16,51 +16,48 @@
 
 	/**
 	 * Gets the maximum sign index; there are no valid signs with a higher index.
-	 * @return the maximum sign index.
-	 * @post return value is always non-negative.
+	 * @return The maximum sign index.
+	 * @post Return value is always non-negative.
 	 */
 	static SignID GetMaxSignID();
 
 	/**
 	 * Gets the number of signs. This is different than GetMaxSignID()
 	 *   because of the way OpenTTD works internally.
-	 * @return the number of signs.
-	 * @post return value is always non-negative.
+	 * @return The number of signs.
+	 * @post Return value is always non-negative.
 	 */
 	static int32 GetSignCount();
 
 	/**
 	 * Checks whether the given sign index is valid.
-	 * @param sign_id the index to check.
-	 * @return true if and only if the sign is valid.
+	 * @param sign_id The index to check.
+	 * @return True if and only if the sign is valid.
 	 */
 	static bool IsValidSign(SignID sign_id);
 
 	/**
 	 * Get the text on the sign.
-	 * @param sign_id the sign to get the text of.
-	 * @pre sign_id has to be valid (use IsValidSign()).
-	 * @return the text on the sign.
-	 * @note the returned name must be free'd (C++ only).
+	 * @param sign_id The sign to get the text of.
+	 * @pre IsValidSign(sign_id).
+	 * @return The text on the sign.
 	 */
 	static char *GetText(SignID sign_id);
 
 	/**
 	 * Gets the location of the sign.
-	 * @param sign_id the sign to get the location of.
-	 * @pre sign_id has to be valid (use IsValidSign()).
-	 * @return the location of the sign.
-	 * @post return value is always valid with AIMap::IsValidTile().
+	 * @param sign_id The sign to get the location of.
+	 * @pre IsValidSign(sign_id).
+	 * @return The location of the sign.
 	 */
 	static TileIndex GetLocation(SignID sign_id);
 
 	/**
 	 * Builds a sign on the map.
-	 * @param location the place to build the sign.
-	 * @param text     the text to place on the sign.
+	 * @param location The place to build the sign.
+	 * @param text The text to place on the sign.
 	 * @pre AIMap::IsValidTile(location).
-	 * @pre text is not NULL and non-empty, i.e. length is positive.
-	 * @return the SignID of the build sign (use IsValidSign() to check for validity).
+	 * @return The SignID of the build sign (use IsValidSign() to check for validity).
 	 *   In test-mode it returns 0 if successful, or any other value to indicate
 	 *   failure.
 	 */
@@ -68,9 +65,9 @@
 
 	/**
 	 * Removes a sign from the map.
-	 * @param sign_id the sign to remove.
-	 * @pre sign_id has to be valid (use IsValidSign()).
-	 * @return true if and only if the sign has been removed.
+	 * @param sign_id The sign to remove.
+	 * @pre IsValidSign(sign_id).
+	 * @return True if and only if the sign has been removed.
 	 */
 	static bool RemoveSign(SignID sign_id);
 };