OPT_DATE('t', NULL, ×tamp, "get timestamp of <time>"),
                OPT_CALLBACK('L', "length", &integer, "str",
                        "get length of <str>", length_callback),
-               OPT_FILENAME('F', "file", &file, "set file to <FILE>"),
+               OPT_FILENAME('F', "file", &file, "set file to <file>"),
                OPT_GROUP("String options"),
                OPT_STRING('s', "string", &string, "string", "get a string"),
                OPT_STRING(0, "string2", &string, "str", "get another string"),