diff --git a/pom.xml b/pom.xml
index 186d06035942c131f3b58511d266b6b6f3688eff..566c9222f818081865892d9d43c3bd6017b58255 100644
--- a/pom.xml
+++ b/pom.xml
@@ -85,6 +85,13 @@
             <version>1.4</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.8.1</version>
+        </dependency>
+
+
         <dependency>
             <groupId>be.cylab</groupId>
             <artifactId>java-roc</artifactId>
diff --git a/src/main/java/be/cylab/java/wowa/training/Utils.java b/src/main/java/be/cylab/java/wowa/training/Utils.java
index ced6a600378d7ac4248b591d08ca99a360b4f69c..f8d06680039a83698e671471b21dd75f82c87a03 100644
--- a/src/main/java/be/cylab/java/wowa/training/Utils.java
+++ b/src/main/java/be/cylab/java/wowa/training/Utils.java
@@ -247,6 +247,11 @@ public final class Utils {
         return true_alert;
     }
 
+    /**
+     * Function to convert a List of double to an Array of doubles.
+     * @param elements
+     * @return
+     */
     public static double[] convertListDoubleToArrayDouble(
             final List<Double> elements) {
         Double[] w = new Double[elements.size()];