diff --git a/tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java b/tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java
index 9798d78316f0dfded3b60bb68094c24b9dc68ac7..5d5dae70cfd784b019d8ae28f3cb82ad8e25a402 100644
--- a/tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java
+++ b/tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java
@@ -101,8 +101,8 @@ public class TreeWaterDemand {
 				int dayOfYear = counter.getDayOfYear();
 				double hourOfDay = counter.getHour() + 0.5;
 
-				double extraterrestrialRadiation = extraterrestrialRadiation(dayOfYear, hourOfDay, lz, lm); // ra
-				double netLongwaveRadiation = rnl(temp, actualVaporPressure, incomingRadiation, height, extraterrestrialRadiation); // rnl
+				double extraterrestrialRadiation = ra(dayOfYear, hourOfDay, lz, lm);
+				double netLongwaveRadiation = rnl(temp, actualVaporPressure, incomingRadiation, height, extraterrestrialRadiation);
 				double netRadiation = rn(incomingRadiation, netLongwaveRadiation);
 				double et0 = et0(temp, actualVaporPressure, incomingRadiation, height, windSpeed, humidity, netRadiation);
 				double et0u = et0u(svf, advection, et0);
@@ -190,12 +190,14 @@ public class TreeWaterDemand {
 		}
 	}
 
+	// Net radiation
 	// unit is apparently [MJ / (m².h)]
 	private static double rn(double shortWaveRadiation, double rnl) {
 		// 1 - 0.23: albedo effect of grass
 		return (1 - 0.23) * shortWaveRadiation - rnl;
 	}
 
+	// NetLongwaveRadiation
 	// unit is apparently [MJ / (m².h)]
 	private static double rnl(double temperature, double actualVaporPressure, double shortWaveRadiation, double height,
 			double extraterrestrialRadiation){
@@ -214,7 +216,8 @@ public class TreeWaterDemand {
 				* (1.35 * rsRsoQuotient - 0.35);
 	}
 
-	private static double extraterrestrialRadiation(int dayOfYear, double hourOfDay, double lz, double lm) {
+	// ExtraterrestrialRadiation
+	private static double ra(int dayOfYear, double hourOfDay, double lz, double lm) {
 		double dr = 1 + 0.033 * Math.cos(2 * Math.PI * dayOfYear / 365d);
 		double b = (2 * Math.PI * (dayOfYear - 81)) / 364;
 		double sc = 0.1645 * Math.sin(2 * b) - 0.1255 * Math.cos(b) - 0.025 * Math.sin(b);