"At its meeting on 7 and 8 June 2013, the Council agreed to instruct the Working Party for Schengen Matters to make suggestions by November 2013 for an increased and harmonised use of the SIS
“At its meeting on 7 and 8 June 2013, the Council agreed to instruct the Working Party for Schengen Matters to make suggestions by November 2013 for an increased and harmonised use of the SIS alert system in the context of jihadists travelling from Europe in great numbers to Syria and other hotspots, which constitutes a serious problem for European internal security.”
See the full text: Council of the European Union: Foreign fighter and returnees from a counter-terrorism perspective (11928/13, pdf)