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					Originally Posted by tn4w  Hello, 
Is there a built-in way to store webpage URL of books? In the book details pane, there is the Authors entry and if one of them is clicked, a web page (https://www.goodreads.com/ ) opens. In a similar manner, I'd like to see a link to a product detail page in the book details pane. If a link is clicked, it brings the user to the webpage. 
 
Do I have to create a custom field for this? Or is there a built-in one already? Being able to store an associated URL with the calibredb add  command would be nice. | 
	
 I use the identifiers for that, as shown below:
 
There's also a way to insert URLs manually as an identifier, using something like 
	Code:
	url:http://www.gutenberg.org/ebooks/17829
 That's a good question, to which I look forward to seeing others' input