diff --git a/DotUML/Diagramme_cas/diagramme_sequence/connexion/diagramme_connexion b/DotUML/Diagramme_cas/diagramme_sequence/connexion/diagramme_connexion
index 1185065..7398a15 100644
--- a/DotUML/Diagramme_cas/diagramme_sequence/connexion/diagramme_connexion
+++ b/DotUML/Diagramme_cas/diagramme_sequence/connexion/diagramme_connexion
@@ -9,3 +9,14 @@ SequenceDiagram [frame=true framecolor=steelblue label="Connexion nominale"] {
   person -r-> web "ok"
   User <-r- web "connecté"
 }
+SequenceDiagram [frame=true framecolor=steelblue label="Connexion erronée"] {
+  actor User
+  lifeline "OnlineBet" as web
+  lifeline "Bob : Personne" as person
+ 
+  User --> web "connecte(bobleparieur@gmail.com,1234)"
+  activate web
+  web --> person "connecte(bobleparieur)"
+  person -r-> web "erreur(informations_incorrectes)"
+  User <-r- web "erreur(informations_incorrectes)"
+}