diff --git a/src/main/java/no/nibio/vips/util/WeatherElements.java b/src/main/java/no/nibio/vips/util/WeatherElements.java
index a9c201917fed053f98dfd5ab48c7668b5b38f2ab..8919a28aff48320b12739143da2904a95301dc78 100755
--- a/src/main/java/no/nibio/vips/util/WeatherElements.java
+++ b/src/main/java/no/nibio/vips/util/WeatherElements.java
@@ -94,7 +94,9 @@ public class WeatherElements {
      * Average wind speed (meters / second) for the last 10 minutes, measured at 10 meter height
      */
     public static final String WIND_SPEED_10MIN_10M = "FF";
-          
+    /**
+     * Potential evapotranspiration by the Penman equation
+     */
     public static final String POTENTIAL_EVAPORATION = "EPP";