The phrase
"clarification purposes" means that something is being done or said in order to make something clearer or easier to understand.
Full definition
For
clarification purposes, no the ring in the photo is not mine, Kay Jewelers let me try it on and dream a bit!
Although I'm sure that everybody knows what a selfie is, for
clarification purposes, it's a photo that you take of yourself.
For
clarification purposes, I felt it was important to help clear up the confusion — John Carter of Mars is not a Disney / Pixar film, but is actually a Disney film.
I added additional info where I felt the user might go into problems, or for
clarification purposes.