Acknowleding referee suggestions after rejection I submitted a paper to a conference, it got rejected but I received valuable feedback. After implementing the suggested changes, I am submitting the manuscript to a different conference but I would like to thank the referees from the previous conference. 

If I just write "We thank the reviewers for their invaluable suggestions" then it might be confusing for the referees of the current (second) conference. 

What are you doing in such a situation?
How about:


  We would like to thank X and Y for their review of a previous version of this manuscript