The phrase "additional suggestion" is correct and usable in written English.
You can use it when you want to offer more than one suggestion or to provide further recommendations on a topic.
Example: "In addition to the main proposal, I have an additional suggestion that could enhance our project outcomes."
Alternatives: "further recommendation" or "extra proposal".
In addition to the above explanation, one additional suggestion is that the promoter region of protein-coding genes is not the prime target for this histone modification (i.e., methyl-H3K9).
Still others suggested bonuses or tips before major festivals and an additional suggestion was the provision of identity cards to make them more recognizable to the community.
Gretchen's last words, apart from her calling of Faust's name, are 'mir grauts vor dir', well translated by Williams as 'you horrify me,' although grauen has an additional suggestion of 'fear' and 'shivers' and 'creeps'creeps
I have an additional suggestion: Many readers are probably curious — how many books have to be sold each week to earn a spot on a New York Times best-seller list?
Beth Stewart, CEO of executive search firm Trewstar Corporate Board Services, offers an additional suggestion.
I've seen it in the form of the Trust Project with the additional suggestion by Jeff Jarvis.
Additional suggestions come trickling in: from the prescreeners but also from sales agents, distributors and other programmers.
Additional suggestions that they might grievously miss their captain, John Terry, at this critical point were summarily dismissed.
Additional suggestions for the subway code were sought yesterday afternoon at the Pacific Street station in Brooklyn, where many riders enthusiastically signed on to the idea of vigilante jurisprudence.
Among the more creative additional suggestions were Sid Solomon's elegant M/X/X, philbo's efficient – – – – – – – – X, and Dr W's straightforward IIIIIIIIII.
Ms. Quintana and her friends like the plan, although Leo Vazquez, who lives in the north Bronx, and who refers to the beach as the Puerto Rican Riviera, had a few additional suggestions.
