diff --git a/definitions/mars/class.table b/definitions/mars/class.table
index 55b321573..f2338f0ad 100644
--- a/definitions/mars/class.table
+++ b/definitions/mars/class.table
@@ -46,6 +46,9 @@
 45 ml Machine learning
 46 d1 Destination Earth
 47 o6 ECMWF Ocean ReAnalysis version 6 (EORA6)
+48 eh C3S European hydrology
+49 gh C3S Global hydrology
+50 ci CERISE project
 99 te Test
 100 at Austria
 101 be Belgium