Contributing to waLBerla will require a signed copy of the Chair for System Simulation Contributor Agreement (LSSCA). The LSSCA is an adapted version of the Sun/Oracle Contributor Agreement. Signing a contributor agreement is necessary for many reasons. For an overview, see http://oss-watch.ac.uk/resources/cla. You can download the LSSCA at http://walberla.net/lss_contributor_agreement.pdf. Please send a signed copy to us via fax (+49 9131 85-28928) or mail it to Universität Erlangen-Nürnberg Lehrstuhl für Systemsimulation (Informatik 10) Cauerstraße 11 91058 Erlangen Germany After we have received your agreement, we will create a GitLab account on https://i10git.cs.fau.de/ for you. GitLab Merge Requests are the only acceptable facility for code submission. Please do not use GitHub pull requests and do not send patches by email. Thank you for contributing!