diff --git a/web/html/adduser.html b/web/html/adduser.html
index 6526715..ff4f429 100644
--- a/web/html/adduser.html
+++ b/web/html/adduser.html
@@ -153,6 +153,11 @@
          <button type="button"  class="btn-close" aria-label="Close"></button>
       </div>
 
+      <div class="alert alert-danger alert-dismissible hidden" id="syntaxAlert" role="alert">
+        <div>Erreur d'entrée dans le formulaire</div>
+         <button type="button"  class="btn-close" aria-label="Close"></button>
+      </div>
+
       <div class="alert alert-danger alert-dismissible hidden" id="unknownAlert" role="alert">
         <div>Erreur inconnue</div>
          <button type="button"  class="btn-close"  aria-label="Close"></button>
diff --git a/web/js/addUser.js b/web/js/addUser.js
index c03578b..ca19c5a 100644
--- a/web/js/addUser.js
+++ b/web/js/addUser.js
@@ -79,6 +79,9 @@ document.getElementById("addUser").addEventListener("click", function(){
                 case 403:
                     idAlert="forbidden";
                     break;
+                case 403:
+                    idAlert="syntaxe";
+                    break;
                 case 500:
                     idAlert="internalServer";
                     break;