The phrase "additional markings" is correct and usable in written English.
It can be used when referring to extra symbols, labels, or annotations that are added to an object or document for clarification or identification.
Example: "Please ensure that all packages have additional markings to indicate their contents and handling instructions."
Alternatives: "extra labels" or "supplementary symbols".
Since the game's rules state that no additional markings can be added to the field of play, the inventor believed that the best solution would be for a line to be made from a substance that would vanish soon after — "like shaving foam".
Unlike in the similar lined catshark, there are no spots or additional markings between the saddles.
There are additional markings 300 mm long and perpendicular to the back line that denote distances of 10 m and 5 m from each goal post.
In conclusion, let me say that great importance also attaches to additional markings for regional specialities and for organic food products, since we know that these too are widely recognised and trusted both within and beyond the European market, and such goodwill must be nurtured.
Its legs are a lighter brown and completely uniform in color, with no additional markings.
The Roads and Traffic Agency developed additional road markings in order to support driver decisions on speed on 70 km/h roads in Flanders-Belgium.
In this paper the results are presented of two evaluation studies, both a field study and a simulator study, on the effects of the additional road markings on speed behaviour.
Juvenile females have additional white markings on the abdomen.
There are also black and tan, and sometimes liver and tan, as well as a variety of color mixtures of those solid colors including roans, roan and tans, tricolors and those solid colors with additional white markings.
However fusions of these spots and the location of additional small markings in this region differed among individuals.
Containers and vehicles have special markings, and additional documentation is needed to accompany the shipment.
