diff --git a/src/serverP2P/ServerP2P.java b/src/serverP2P/ServerP2P.java
index 313d263..be8bfec 100644
--- a/src/serverP2P/ServerP2P.java
+++ b/src/serverP2P/ServerP2P.java
@@ -35,15 +35,21 @@ public class ServerP2P {
 	 * @param args	parameters
 	 */
 		public static void main(String [] args) {
-		ServerP2P s = new ServerP2P(args[1]);
-		ServerManagementUDP smudp = new ServerManagementUDP(s.directories.getDataHomeDirectory() + subdir, s.port, s.logger);
-		ServerManagementTCP smtcp = new ServerManagementTCP(s.directories.getDataHomeDirectory() + subdir, s.port, s.logger);
-		Thread tudp = new Thread(smudp);
-		tudp.setName("server UDP P2P-JAVA-PROJECT");
-		tudp.start();
-		Thread ttcp = new Thread(smtcp);
-		ttcp.setName("server TCP P2P-JAVA-PROJECT");
-		ttcp.start();
+
+			if (args[1].equals("help") || args[1].equals("-h") || args[1].equals("h")){
+				System.out.println("usage : java -ea serveurP2P.ServeurP2P -- <serveurPORT> <trackerHOSTNAME> <trackerPORT>");
+			}
+			else{
+				ServerP2P s = new ServerP2P(args[1]);
+				ServerManagementUDP smudp = new ServerManagementUDP(s.directories.getDataHomeDirectory() + subdir, s.port, s.logger);
+				ServerManagementTCP smtcp = new ServerManagementTCP(s.directories.getDataHomeDirectory() + subdir, s.port, s.logger);
+				Thread tudp = new Thread(smudp);
+				tudp.setName("server UDP P2P-JAVA-PROJECT");
+				tudp.start();
+				Thread ttcp = new Thread(smtcp);
+				ttcp.setName("server TCP P2P-JAVA-PROJECT");
+				ttcp.start();
+			}
 	}
 
 }