i disagree that vowel harmony is the place to discuss i mutation in welsh i see no reason why this article or umlaut and a mutation for that matter should be restricted to germanic i think this article should be about any fronting raising process triggered by a following high front vocoid regardless of what language it's attested in likewise a mutation shouldn't be restricted to germanic but should include lowering caused by a following a in other languages as well again an example from welsh gwyn 'white masc ' windos vs gwen 'white fem ' wind umlaut should mostly be about the written sign with an indication that it also the name for processes like i mutation and a mutation vowel harmony should be about the left to right processes typical of uralic and altaic languages that's what i think comhr