diff --git a/definitions/mars/grib.enda.4i.def b/definitions/mars/grib.enda.4i.def
new file mode 100644
index 000000000..5dd97dbc8
--- /dev/null
+++ b/definitions/mars/grib.enda.4i.def
@@ -0,0 +1,2 @@
+alias mars.number = perturbationNumber;
+alias mars.iteration = iterationNumber;