Thank you a lot. This is exactly, what I was searching for.

Hello, everybody. This is my first post to the forum. I have read a bit about cryptocurrencies but I am still rather newbie to the field. I would like to ask: Can I somehow "mark" a transaction? I will give an example to make my question clear. For example: Name me Bob. I want to give 1 BTC to Alice, for her to buy a new motherboard and processor. So I send 1 BTC to her wallet. Can i somehow give a "title" to this transaction, for example "Money to buy a computer"? Just like the title of an e-mail for example.
Thank you kindly in advance.