This post introduces how to comment out some text in a .bib file.
Sometimes we need to keep some information associated with a paper, such as web link where we can find the file, but we do not want it appears in the references.
It said that “//” or “%” works for some cases, but apparently it does not work for me. My solution is use comment = {add the info you wanted to comment with this pair of curly brackets},
See below for an example.
@article{author2015paper,
title={paper title here},
author={author name},
comment={https://example.pdf},
year={2015}
}