-* @brief Called to get key string once for each key-value pair in the preference.
-*
-* @remarks You should not free @a key returned by this function.
-*
-* @param [in] key The key of the value added to the preference
-* @param [in] value The value associated with the key
-* @param [in] user_data The user data passed from the foreach function
-* @return @c true to continue with the next iteration of the loop, \n @c false to break out of the loop.
-* @pre preference_foreach_item() will invoke this callback function.
-* @see preference_foreach_item()
-*/
+ * @brief Called to get key string, once for each key-value pair in the preference.
+ *
+ * @since_tizen 2.3
+ * @remarks You should not free the @a key returned by this function.
+ *
+ * @param[in] key The key of the value added to the preference
+ * @param[in] value The value associated with the key
+ * @param[in] user_data The user data passed from the foreach function
+ * @return @c true to continue with the next iteration of the loop,
+ * otherwise @c false to break out of the loop
+ * @pre preference_foreach_item() will invoke this callback function.
+ * @see preference_foreach_item()
+ */