At the Sixth Ministerial Plenary Meeting in New York on 27 September 2015, Global Counterterrorism Forum (GCTF) Ministers endorsed the launch of the GCTF’s Initiative to Address the Life Cycle of Radicalization to Violence (Life Cycle Initiative). As part of this new initiative, and in recognition of the complexity of the issues relating to returning “foreign terrorist fighters” (RFTFs) and the need for additional detail, the GCTF’s “Foreign Terrorist Fighters” (FTF) Working Group was tasked to develop an Addendum relating to elements of Good Practice 19 of the GCTF’s The Hague-Marrakech Memorandum on Good Practices for a More Effective Response to the FTF Phenomenon (The Hague-Marrakech Memorandum), and other relevant issues pertaining to RFTFs. This Addendum to the GCTF’s The HagueMarrakech Memorandum is a contribution to this initiative