diff --git a/mission_yaml/SEA68_M30.yml b/mission_yaml/SEA68_M30.yml
index f6e7894..8fc5a94 100644
--- a/mission_yaml/SEA68_M30.yml
+++ b/mission_yaml/SEA68_M30.yml
@@ -29,7 +29,8 @@ metadata:
   glider_name: Aster
   glider_serial: '68'
   wmo_id: '6801602'
-  comment: .nan
+  comment: Altitude set to 2m for the entire mission duration. Zt/zs set to 2m for
+    the entire mission duration
   contributor_name: Callum Rollo, Louise Biddle, Olle Petersson, Aleksandra Mazur,
     Marcus Melin, Gunnar Johnsson, Andrew Birkett, Chiara Monforte
   contributor_role: Data Processor, PI, Head of Operations, Glider Technician, Glider