diff --git a/port/models.py b/port/models.py
index 0fc065d..ceed1a3 100644
--- a/port/models.py
+++ b/port/models.py
@@ -8,6 +8,14 @@ from phonenumber_field.modelfields import PhoneNumberField
 from django.core.exceptions import ValidationError
 from django.utils.translation import gettext_lazy as _
 
+# MODELS
+
+# Warning :
+# If you modify a Model sub-class attribute, you
+# should then run :
+# ./manage.py makemigrations
+# ./manage.py migrate
+
 def validate_positive(value):
     if value < 0:
         raise ValidationError(
@@ -145,6 +153,8 @@ class SailsOn(Model):
     is_guest = BooleanField()
     is_pet = BooleanField()
 
+    present = BooleanField(default=True)
+
 class BoatInsurance(Model):
     contract = IntegerField(blank=True,null=True)
     date = DateTimeField(auto_now_add=True)