diff --git a/cntmanage/flightslot/admins/student_adm.py b/cntmanage/flightslot/admins/student_adm.py
index b1e328a..c4e942e 100644
--- a/cntmanage/flightslot/admins/student_adm.py
+++ b/cntmanage/flightslot/admins/student_adm.py
@@ -59,7 +59,7 @@ class ChangeCourseForm(AdminActionForm):
 class StudentAdmin(ImportMixin, AdminActionFormsMixin, admin.ModelAdmin):
     list_display = ("surname", "name", "course", "course_color", "email", "phone", "username", "password", "active",)
     list_filter = ("course", "active",)
-    search_fields= ("surname", "name", "phone", "email",)
+    search_fields = ("surname", "name", "phone", "email",)
     actions = ("change_course", "disable_students",)
     resource_classes = [StudentResource]
     confirm_form_class = StudentCustomConfirmImportForm
diff --git a/cntmanage/flightslot/admins/weekpref_adm.py b/cntmanage/flightslot/admins/weekpref_adm.py
index dd4fd06..47763d6 100644
--- a/cntmanage/flightslot/admins/weekpref_adm.py
+++ b/cntmanage/flightslot/admins/weekpref_adm.py
@@ -21,7 +21,8 @@ from datetime import date
 class WeekPreferenceAdmin(nested_admin.NestedPolymorphicModelAdmin):
     inlines = (TrainingInLIne, HourBuildingInLine, )
     list_display = ("week", "student__surname","student__name", "student__course", "course_color", "student_brief_mix",)
-    list_filter = ("week", "student__course", "student",)
+    list_filter = ("week", "student__course",)
+    search_fields = ("student__surname","student__name",)
     actions = ("export",)
 
     @admin.action(description="Export Selected Preferences")
diff --git a/cntmanage/flightslot/migrations/0021_alter_hourbuildinglegstop_refuel.py b/cntmanage/flightslot/migrations/0021_alter_hourbuildinglegstop_refuel.py
new file mode 100644
index 0000000..701bee7
--- /dev/null
+++ b/cntmanage/flightslot/migrations/0021_alter_hourbuildinglegstop_refuel.py
@@ -0,0 +1,18 @@
+# Generated by Django 5.2.8 on 2025-11-27 10:56
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('flightslot', '0020_alter_hourbuildinglegbase_options_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='hourbuildinglegstop',
+            name='refuel',
+            field=models.BooleanField(default=False, verbose_name='Stop for Refuelling'),
+        ),
+    ]
diff --git a/cntmanage/flightslot/models/hourbuildings.py b/cntmanage/flightslot/models/hourbuildings.py
index 3de50e6..c92af17 100644
--- a/cntmanage/flightslot/models/hourbuildings.py
+++ b/cntmanage/flightslot/models/hourbuildings.py
@@ -124,8 +124,10 @@ class HourBuildingLegFlight(HourBuildingLegBase):
     
 class HourBuildingLegStop(HourBuildingLegBase):
 
-    refuel = models.BooleanField(
-        default=False
+    refuel = models.BooleanField (
+        null=False,
+        default=False,
+        verbose_name="Stop for Refuelling"
     )
 
     # Change displayed name in the inline form