Many journals allows one to post an author's accepted manuscript online, provided some embargo period has lapsed and an acknowledgment is included. For example, for Springer Nature journals, an acknowledgement of the following form should be included:
“This is a post-peer-review, pre-copyedit version of an article published in [insert journal title]. The final authenticated version is available online at: http://dx.doi.org/[insert DOI]”.
I have two question about arXiv.
Question 1: Is it enough to include this acknowledgement in arXiv's Comments section, without including it in the source file?
Question 2: Is it OK not to write the sentence above altogether, but to fill out arXiv's Journal reference and DOI fields?