diff --git a/share/metkit/language.yaml b/share/metkit/language.yaml
index a2bd2c72..ec319f79 100644
--- a/share/metkit/language.yaml
+++ b/share/metkit/language.yaml
@@ -655,6 +655,7 @@ _field: &_field
       - [pl, pressure levels]
       - [fl, flight levels]
       - [hl, height levels]
+      - [hmsl, height above mean sea level]
       - [pt, potential temperature]
       - [pv, potential vorticity]
       - [sfc, surf, surface] # sl ??