diff --git a/jsprit-core/src/main/java/jsprit/core/problem/Skills.java b/jsprit-core/src/main/java/jsprit/core/problem/Skills.java
index 402171b9..36142574 100644
--- a/jsprit-core/src/main/java/jsprit/core/problem/Skills.java
+++ b/jsprit-core/src/main/java/jsprit/core/problem/Skills.java
@@ -1,3 +1,20 @@
+/*******************************************************************************
+ * Copyright (C) 2014  Stefan Schroeder
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3.0 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ ******************************************************************************/
+
 package jsprit.core.problem;
 
 import java.util.Collection;
@@ -71,6 +88,20 @@ public class Skills {
         return Collections.unmodifiableSet(skills);
     }
 
+    public String toString(){
+        String s = "[";
+        boolean first = true;
+        for(String skill : values()){
+            if(first){
+                s += skill;
+                first = false;
+            }
+            else s += ", " + skill;
+        }
+        s += "]";
+        return s;
+    }
+
     /**
      * Not case sensitive.
      *
diff --git a/jsprit-core/src/main/java/jsprit/core/problem/vehicle/VehicleImpl.java b/jsprit-core/src/main/java/jsprit/core/problem/vehicle/VehicleImpl.java
index 8a376796..48ea5033 100644
--- a/jsprit-core/src/main/java/jsprit/core/problem/vehicle/VehicleImpl.java
+++ b/jsprit-core/src/main/java/jsprit/core/problem/vehicle/VehicleImpl.java
@@ -315,7 +315,9 @@ public class VehicleImpl extends AbstractVehicle{
                 "[startLocationCoordinate=" + startLocationCoord + "]" +
                 "[endLocationId=" + endLocationId+"]" +
                 "[endLocationCoordinate=" + endLocationCoord + "]" +
-                "[isReturnToDepot=" + isReturnToDepot() + "]";
+                "[isReturnToDepot=" + isReturnToDepot() + "]" +
+                "[skills="+ skills + "]";
+
 	}
 
 	@Override