diff --git a/definitions/mars/class.table b/definitions/mars/class.table
index b1c171c65..55b321573 100644
--- a/definitions/mars/class.table
+++ b/definitions/mars/class.table
@@ -45,7 +45,7 @@
 44 gg Greenhouse Gases
 45 ml Machine learning
 46 d1 Destination Earth
-47 o6 Ocean ReAnalysis 6
+47 o6 ECMWF Ocean ReAnalysis version 6 (EORA6)
 99 te Test
 100 at Austria
 101 be Belgium