All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
It is more appropriate to avoid writing on the margin of the Mus’haf (the Arabic text of the Quran) as a way of glorifying the Book of Allaah and fearing that this would cause confusion for the reader.
Indeed, the Permanent Committee of Iftaa’ issued a Fatwa regarding writing on the margin of the Mus’haf, the number of this Fatwa is 18618.
Allaah Knows best.