diff --git a/ChangeLog b/ChangeLog
index e113d6887cc3fb107daa0048b337acc43107e100..1abe3e0b4648c68c70bd46f9fc907de407bc4c85 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2018-05-04  Oliver Lemke  <olemke@core-dump.info>
+
+	* ARTS-XML-DATA-2-3-25
+	
+	* planets/Earth/ECMWF/IFS/Eresmaa_137L/README:
+
+	Add info that 1 means land, and 0 ocean in land/sea mask.
+
+	Add info that wind directory of 0 means North.
+
 2017-03-01 Richard Larsson <ric.larsson@gmail.com>
 
 	* ARTS-XML-DATA-2-3-24
diff --git a/planets/Earth/ECMWF/IFS/Eresmaa_137L/README b/planets/Earth/ECMWF/IFS/Eresmaa_137L/README
index 0c84bd6951b33ea75389a7d0b0d92df213ff90ab..0e5d678cda281c4746cb18513339cdfc037abec4 100644
--- a/planets/Earth/ECMWF/IFS/Eresmaa_137L/README
+++ b/planets/Earth/ECMWF/IFS/Eresmaa_137L/README
@@ -33,11 +33,12 @@ Files
     5) 2m Temperature [K]
     6) 2m Dew point temperature [K]
     7) 10m wind speed [m/s]
-    8) 10m wind direction [-180 to 180 DEG] (to where the wind blows)
+    8) 10m wind direction [-180 to 180 DEG] (to where the wind blows,
+       0 means North)
     9) Stratiform precipitation at surface [m]
     10) Convective precipitation at surface [m]
     11) Snowfall at surface [m] (water equival.)
-    12) Land/sea Mask [0-1]
+    12) Land/sea Mask [0-1] (1=land, 0=ocean)
     13) Latitude [deg]
     14) Longitude [deg]
     15) Year