diff --git a/CHANGELOG.md b/CHANGELOG.md
index 24666785..b7b096ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 Change-log
 ==========
+**v1.4.1** @ 2014-09-25
+- bugfix [#131](https://github.com/jsprit/jsprit/issues/131)
+- bugfix [#134](https://github.com/jsprit/jsprit/issues/134)
+
 **v1.4** @ 2014-09-08
 
 <b>! Break change !</b>
diff --git a/WHATS_NEW.md b/WHATS_NEW.md
index cf92105b..48f7cfee 100644
--- a/WHATS_NEW.md
+++ b/WHATS_NEW.md
@@ -3,6 +3,12 @@ WHATS NEW
 
 ------------------------------
 
+<b>2014-09-25</b> new release **v1.4.1**
+
+It contains a fix of a critical bug (see [#134](https://github.com/jsprit/jsprit/issues/134)).
+
+------------------------------
+
 <b>2014-09-08</b> new release **v1.4**
 
 v1.4 breaks your code! Look at [changelog](https://github.com/jsprit/jsprit/blob/master/CHANGELOG.md) to migrate from v1.3.1 to v1.4.
diff --git a/jsprit-core/src/main/java/jsprit/core/problem/VehicleRoutingProblem.java b/jsprit-core/src/main/java/jsprit/core/problem/VehicleRoutingProblem.java
index 1c4f4fdc..eaa43f38 100644
--- a/jsprit-core/src/main/java/jsprit/core/problem/VehicleRoutingProblem.java
+++ b/jsprit-core/src/main/java/jsprit/core/problem/VehicleRoutingProblem.java
@@ -288,7 +288,12 @@ public class VehicleRoutingProblem {
 		}
 
 
-
+        /**
+         * Adds an initial vehicle route.
+         *
+         * @param route initial route
+         * @return the builder
+         */
         public Builder addInitialVehicleRoute(VehicleRoute route){
 			addVehicle((AbstractVehicle)route.getVehicle());
             for(TourActivity act : route.getActivities()){
@@ -324,6 +329,12 @@ public class VehicleRoutingProblem {
             }
         }
 
+        /**
+         * Adds a collection of initial vehicle routes.
+         *
+         * @param routes initial routes
+         * @return the builder
+         */
         public Builder addInitialVehicleRoutes(Collection<VehicleRoute> routes){
 			for(VehicleRoute r : routes){
 				addInitialVehicleRoute(r);
@@ -728,20 +739,37 @@ public class VehicleRoutingProblem {
 		return activityCosts;
 	}
 
+    /**
+     * @return returns all location, i.e. from vehicles and jobs.
+     */
 	public Locations getLocations(){
 		return locations;
 	}
 
+    /**
+     * @param job for which the corresponding activities needs to be returned
+     * @return associated activities
+     */
     public List<AbstractActivity> getActivities(Job job){
         return Collections.unmodifiableList(activityMap.get(job));
     }
 
+    /**
+     * @return total number of activities
+     */
     public int getNuActivities(){ return nuActivities; }
 
+    /**
+     * @return factory that creates the activities associated to a job
+     */
     public JobActivityFactory getJobActivityFactory(){
         return jobActivityFactory;
     }
 
+    /**
+     * @param job for which the corresponding activities needs to be returned
+     * @return a copy of the activities that are associated to the specified job
+     */
     public List<AbstractActivity> copyAndGetActivities(Job job){
         List<AbstractActivity> acts = new ArrayList<AbstractActivity>();
         if(activityMap.containsKey(job)) {