The phrase "an additional requirement for" is correct and usable in written English.
You can use it when specifying an extra condition or criterion that must be met in a particular context, such as in guidelines or instructions.
Example: "Before submitting your application, please ensure that you meet all the criteria, including an additional requirement for a personal statement."
Alternatives: "a further requirement for" or "an extra condition for".
In addition to Nodal and Wnt signalling, we have recently uncovered an additional requirement for Fibroblast Growth Factor (FGF) signalling in endoderm and ADE specification (Morrison et al., 2008).
This brings up an additional requirement for ethical, sustainable businesses to succeed – exceptional management talent.
The maximum display luminance and color gamut are, respectively, taken as an additional requirement for determining the relative primary luminances of the display.
That is, they are physically as much "planets" as Mercury or Mars, but they have not "cleared their orbital region of other objects," an additional requirement for "planethood" imposed by the International Astronomical Union (IAU) in 2006.
The non-affiliation requirement no more establishes an additional requirement for the office of Representative than the requirement that the candidate win the primary to secure a place on the general ballot or otherwise demonsrate substantial community support.
Ease of manipulation relates to average solutions per case because this (more than one solution) can be seen as an additional requirement for CBR systems.
The analysis of mutants of three related RLCKs revealed an additional requirement of Botrytis-induced kinase 1 (BIK1) for the MAMP/DAMP-induced calcium elevation.
Second, the small element size (12 µm) yields low directional sensitivity, which is an important additional requirement for an accurate image reconstruction.
Recently, it was suggested that the stability of HA in an acidic environment might be an important additional requirement for airborne transmission between mammals.
We note that, in more than 38,000 words of interview content, the word "governance" was mentioned only twice, once as an unanticipated additional requirement for implementation and once as a lesson learned after implementation.
This result also suggests that there is no additional requirement for a transvection-mediating protein to bind a CRM for it to function in trans.
