diff --git a/GEOMS-TE-OPC-AEROSOL-001.csv b/GEOMS-TE-OPC-AEROSOL-001.csv
index 6128744302217e34c0fadf12a41905b2c0c4cf1f..ce2d05d4bf164524de559790abd9f8d3e1dfd51a 100644
--- a/GEOMS-TE-OPC-AEROSOL-001.csv
+++ b/GEOMS-TE-OPC-AEROSOL-001.csv
@@ -2,7 +2,7 @@
 2,DATETIME.START,DATETIME,MJD2K,DOUBLE,Start DateTime of measurement,o
 2,DATETIME.STOP,DATETIME,MJD2K,DOUBLE,Stop DateTime of measurement,o
 2,INTEGRATION.TIME,[CONSTANT|DATETIME],s,REAL,Effective/Actual integration time,o
-2,ALTITUDE,ALTITUDE,m,REAL,Geometric height calculated from the GPS,x
+2,ALTITUDE,[ALTITUDE|DATETIME],m,REAL,Geometric height calculated from the GPS,x
 2,LATITUDE,[CONSTANT|ALTITUDE|DATETIME],deg,REAL,In-situ GPS latitude of the instrument if reported otherwise launch geolocation,x
 2,LONGITUDE,[CONSTANT|ALTITUDE|DATETIME],deg,REAL,In-situ GPS longitude of the instrument if reported otherwise launch geolocation,x
 2,FLOWRATE,DATETIME,cm3 s-1,REAL,Instrument flowrate,o