Our note in footnote of a book

How do I designate the footnotes that are mine inside a quote?

I tried "our note", "note ours" and "remark is ours". Which one is the correct one and most commonly used? Or is there some other way?

For example:

He provides an argument for it:
   "Before the Greeks, the ancient Egyptians 
   used it[1] in the construction of their great pyramids."


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[1] The Golden Section - note ours. <-- this is MY (drozzy's) note, not the original author's 

So you can see there is my note inside a quote.

Or if I have something without a footnote.

He provides an argument for it:

   "Before the Greeks, the ancient Egyptians 
   used it (Golden Section - note ours) in

   the construction of their great pyramids."

Note where I use note ours, to clarify that it is a Golden Section.

Any help appreciated.