diff --git a/src/main/java/net/itsthesky/projetbut2/Main.java b/src/main/java/net/itsthesky/projetbut2/Main.java
index 4320f24..df87722 100644
--- a/src/main/java/net/itsthesky/projetbut2/Main.java
+++ b/src/main/java/net/itsthesky/projetbut2/Main.java
@@ -1,5 +1,10 @@
 import net.itsthesky.projetbut2.dip.DIPClient;
+import net.itsthesky.projetbut2.ocp.OCPClient;
 
-void main() {
-    DIPClient.main();
+void main(String[] args) {
+    if (args.length == 0) return;
+
+    if (args[0].equalsIgnoreCase("ocp")) OCPClient.main();
+    else if (args[0].equalsIgnoreCase("dip")) DIPClient.main();
+    else IO.println("Invalid argument: '" + args[0] + "'");
 }
\ No newline at end of file
diff --git a/src/main/java/net/itsthesky/projetbut2/dip/BackEndDeveloper.java b/src/main/java/net/itsthesky/projetbut2/dip/BackEndDeveloper.java
index c4b2e70..f4aa5ca 100644
--- a/src/main/java/net/itsthesky/projetbut2/dip/BackEndDeveloper.java
+++ b/src/main/java/net/itsthesky/projetbut2/dip/BackEndDeveloper.java
@@ -2,6 +2,7 @@ package net.itsthesky.projetbut2.dip;
 
 public class BackEndDeveloper implements Developer {
 
+    @Override
     public void develop() {
         IO.println("I write Java code !");
     }