diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/marathon/MarathonAlgorithm.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/marathon/MarathonAlgorithm.java
index beeda8b..cf445b2 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/marathon/MarathonAlgorithm.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/marathon/MarathonAlgorithm.java
@@ -62,9 +62,11 @@ public class MarathonAlgorithm extends ShortestPathAlgorithm {
             if (newPath != null) {
                 // Ajout du path trouvé à l'indice où on l'a enlevé
                 path.replaceArc(arcToRemove, newPath.getArcs());
+                // display path
+                notifyMarathonPathUpdated(path, newPath);
             }
         }
-        
+
         return solution;
     }
 
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathAlgorithm.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathAlgorithm.java
index c9d60d4..a57e374 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathAlgorithm.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathAlgorithm.java
@@ -2,6 +2,7 @@ package org.insa.graphs.algorithm.shortestpath;
 
 import org.insa.graphs.algorithm.AbstractAlgorithm;
 import org.insa.graphs.model.Node;
+import org.insa.graphs.model.Path;
 
 public abstract class ShortestPathAlgorithm extends AbstractAlgorithm<ShortestPathObserver> {
 
@@ -69,6 +70,17 @@ public abstract class ShortestPathAlgorithm extends AbstractAlgorithm<ShortestPa
         }
     }
 
+    /**
+    * Notify the observer that the path has been updated.
+    *
+    * @param path Path that has been updated.
+    */
+    public void notifyMarathonPathUpdated(Path path, Path newSegment) {
+        for (ShortestPathObserver obs: getObservers()) {
+            obs.notifyMarathonPathUpdated(path, newSegment);
+        }
+    }
+
     public double getCostPath() {
         return this.pathCost;
     }
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathObserver.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathObserver.java
index d56d2dc..b93eee8 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathObserver.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathObserver.java
@@ -1,6 +1,7 @@
 package org.insa.graphs.algorithm.shortestpath;
 
 import org.insa.graphs.model.Node;
+import org.insa.graphs.model.Path;
 
 public interface ShortestPathObserver {
 	
@@ -33,5 +34,12 @@ public interface ShortestPathObserver {
 	 * @param node Destination.
 	 */
 	public void notifyDestinationReached(Node node);
+
+  /**
+   * Notify the observer that the path has been updated.
+   *
+   * @param path Path that has been updated.
+   */
+  public void notifyMarathonPathUpdated(Path path, Path newSegment);
 	
 }
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathTextObserver.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathTextObserver.java
index e74cc0a..9f72823 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathTextObserver.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/ShortestPathTextObserver.java
@@ -3,6 +3,7 @@ package org.insa.graphs.algorithm.shortestpath;
 import java.io.PrintStream;
 
 import org.insa.graphs.model.Node;
+import org.insa.graphs.model.Path;
 
 public class ShortestPathTextObserver implements ShortestPathObserver {
 
@@ -34,4 +35,9 @@ public class ShortestPathTextObserver implements ShortestPathObserver {
 
     }
 
+    @Override
+    public void notifyMarathonPathUpdated(Path path, Path newSegment) {
+        // noop
+    }
+
 }
diff --git a/be-graphes-gui/src/main/java/org/insa/graphs/gui/observers/ShortestPathGraphicObserver.java b/be-graphes-gui/src/main/java/org/insa/graphs/gui/observers/ShortestPathGraphicObserver.java
index 12963b4..cc162b4 100644
--- a/be-graphes-gui/src/main/java/org/insa/graphs/gui/observers/ShortestPathGraphicObserver.java
+++ b/be-graphes-gui/src/main/java/org/insa/graphs/gui/observers/ShortestPathGraphicObserver.java
@@ -6,6 +6,7 @@ import org.insa.graphs.algorithm.shortestpath.ShortestPathObserver;
 import org.insa.graphs.gui.drawing.Drawing;
 import org.insa.graphs.gui.drawing.overlays.PointSetOverlay;
 import org.insa.graphs.model.Node;
+import org.insa.graphs.model.Path;
 
 public class ShortestPathGraphicObserver implements ShortestPathObserver {
 
@@ -39,4 +40,11 @@ public class ShortestPathGraphicObserver implements ShortestPathObserver {
         // drawing.drawMarker(node.getPoint(), Color.RED);
     }
 
+    @Override
+    public void notifyMarathonPathUpdated(Path path, Path newSegment) {
+        drawing.clearOverlays();
+        drawing.drawPath(path, Color.BLUE, true);
+        drawing.drawPath(newSegment, Color.RED, false);
+    }
+
 }