diff --git a/doc/locationforecast/datamodel.md b/doc/locationforecast/datamodel.md
index 87d6182..1682b36 100644
--- a/doc/locationforecast/datamodel.md
+++ b/doc/locationforecast/datamodel.md
@@ -45,7 +45,7 @@ Our Nordic forecasts are updated once every hour.
 
 For medium range forecasts (2–10 days) the 51 member ensemble forecast from
 [ECMWF](https://www.ecmwf.int/en/forecasts/datasets/set-iii) is used. It it
-updated twice pr day. Horizontal resolution is approximately 18 km. Air
+updated twice pr day. Horizontal resolution is approximately 9 km. Air
 temperature, precipitation and wind speed are further post-processed to better
 represent local geographical features.