Citing someone directly with additional information in footnote I would like to directly quote some sentences of another author who uses a word A which is a synonym for a word B I'm using in my text. Note: I would like to use my word B as the word A is very rare.

So I placed the text of the author into quotation marks and a footnote at the word A stating that in the following the word B will be used in my text. At the end of the quotation I put the source of the quote.

Is that correct or could it be misinterpreted as a footnote of the text I'm quoting? Should I add e.g. "Authors note:" before my footnote text?
My preference would be to avoid the footnote altogether, as I find them distracting. Keep the quote verbatim, give the source, and then explain the terminology in the next sentence of your text:


  Smith claims that "the best breakfast is a soft boiled ovum" [Smith87]. (Smith's "ovum" refers to what our paper calls an "egg.")


Another option, if you don't really care about  showing  Smith's exact words to the reader, is to make the change in the quote itself, indicating the change with brackets.


  Smith claims that "the best breakfast is a soft boiled [egg]" [Smith87].