diff --git a/include/ntux/ntux.h b/include/ntux/ntux.h
index 29a6f55..07c735b 100644
--- a/include/ntux/ntux.h
+++ b/include/ntux/ntux.h
@@ -105,22 +105,26 @@ struct ntux_unit_ctx {
 	void *				any;
 };
 
-/* package info */
-ntux_api				const struct ntux_source_version * ntux_source_version(void);
-
 /* driver api */
-ntux_api int  ntux_get_driver_ctx	(char ** argv, char ** envp, uint32_t flags, struct ntux_driver_ctx **);
-ntux_api void ntux_free_driver_ctx	(struct ntux_driver_ctx *);
+ntux_api int  ntux_get_driver_ctx       (char **, char **, uint32_t,
+                                         struct ntux_driver_ctx **);
+
+ntux_api void ntux_free_driver_ctx      (struct ntux_driver_ctx *);
 
 /* cmd api */
-ntux_api int  ntux_cmd_stat		(const struct ntux_driver_ctx *, const char *);
-ntux_api int  ntux_cmd_spawn		(const struct ntux_driver_ctx *);
-ntux_api int  ntux_cmd_strace		(const struct ntux_driver_ctx *);
+ntux_api int  ntux_cmd_stat             (const struct ntux_driver_ctx *, const char *);
+ntux_api int  ntux_cmd_spawn            (const struct ntux_driver_ctx *);
+ntux_api int  ntux_cmd_strace           (const struct ntux_driver_ctx *);
 
 /* utility api */
-ntux_api int  ntux_main			(int, char **, char **);
+ntux_api int  ntux_main                 (int, char **, char **);
+
+/* error trace api */
 ntux_api int  ntux_output_error_vector  (const struct ntux_driver_ctx *);
 
+/* package info */
+ntux_api const struct ntux_source_version * ntux_source_version(void);
+
 #ifdef __cplusplus
 }
 #endif