It is a simple phrase that is often used in situations like:
* Writing a note to oneself: You might write "Juste pour me souvenir" at the top of a list or a note to remind yourself what it is about.
* Marking a special event: You might use this phrase to indicate that you are writing something down to remember a specific occasion, such as a birthday or anniversary.
* Saving a memory: You might say "Juste pour me souvenir" when you are taking a picture or writing something down to capture a moment you want to remember.
The phrase conveys a sense of personal significance and a desire to hold onto a memory. It's a simple but meaningful way to express that you want to remember something important.