If you must ask then perhaps it is not. Does the statement "no adjustment was deemed necessary," by itself with no other indication of any market research whatsoever command belief from a reader of your reports? Or, does it just sound like another of the thousands of boilerplate comments appraisers use to make themselves feel like their reports are worth anyone paying anything for them? If you did not know you, how would you take your own comment?
Compare to this (assuming it is really true): "I have completed market research to determine if, given the level of GLA adjustments used, bedroom counts between four and more bedrooms should command additional market adjustment from a measurable market reaction. Measurable market reaction from the available market data could not be extracted, therefore no adjustment is made." Such a statement might be taken to mean the appraiser involved didn't just pull a bunch of boilerplate out of their tail feathers versus actually attempting to answer the question about the market preferences.