For the first time since 1992, the ACM Code of Ethics and Professional Conduct (the Code) is being updated. The Code Update Task Force in conjunction with the Committee on Professional Ethics is seeking advice from ACM members on the update. We indicated many of the motivations for changing the Code when we shared Draft 1 of Code 2018 with the ACM membership in the December 2016 issue of CACMb and with others through email and the COPE website (ethics.acm.org). Since December, we have been collecting feedback and are vetting proposed changes. We have seen a broad range of concerns about responsible computing including bullying in social media, cyber security, and autonomous machines making ethically significant decisions. The Task Force appreciates the many serious and thoughtful comments it has received. In response, the Task Force has proposed changes that are reflected in Draft 2 of the Code. There are a number of substantial changes that require some explanation. In this article, we discuss these, and we explain why we did not include other requested changes in Draft 2. We look forward to receiving your comments on these suggested changes and your requests for additional changes as we work on Draft 3 of the Code. We have provided opportunities for your comments and an open discussion of Draft 2 at the ACM Code 2018 Discussion website [http://code2018.acm.org/discuss]. Comments can also be contributed at the COPE website https://ethics.acm.org, and by direct emails to firstname.lastname@example.org.