How to thank someone who proofread my scientific paper? A colleague working in my department helped me out in proofreading my English before submitting a paper. I would like to acknowledge his help.

Is it common to acknowledge such help? Is there any standard sentence to do it?
The author would like to thank [colleague name and title] for constructive criticism of the manuscript.

No need to get into additional details as after all you are thanking your colleague.