Adding a Parental Advisory sticker to your cover art is optional, but there are important guidelines to follow if you decide to include it.
Guidelines for Using the Parental Advisory Sticker:
If you choose to place the Parental Advisory sticker on your cover art, every track in your release must be marked as explicit. This requirement applies even if some tracks don’t contain explicit content—if the sticker is present, all songs must be tagged as explicit.
By following this guideline, you ensure that your release aligns with industry standards and avoids any potential issues during distribution.