diff --git a/apps/course/admin/participant.py b/apps/course/admin/participant.py
index 641d335..50a0aae 100644
--- a/apps/course/admin/participant.py
+++ b/apps/course/admin/participant.py
@@ -26,7 +26,7 @@ class ParticipantAdmin(admin.ModelAdmin):
         form = super().get_form(request, obj, **kwargs)
         if obj is None:  # Adding a new participant
             # محدود کردن انتخاب دانش‌آموزان به کاربرانی که از نوع StudentUser هستند
-            form.base_fields['student'].queryset = StudentUser.objects.filter(user_type=User.UserType.STUDENT)
+            # form.base_fields['student'].queryset = StudentUser.objects.filter(user_type=User.UserType.STUDENT)
             form.base_fields['student'].widget.can_add_related = True  # فعال کردن دکمه اضافه کردن
  
         return form
diff --git a/apps/course/migrations/0006_auto_20250113_1337.py b/apps/course/migrations/0006_auto_20250113_1337.py
new file mode 100644
index 0000000..f6e31be
--- /dev/null
+++ b/apps/course/migrations/0006_auto_20250113_1337.py
@@ -0,0 +1,23 @@
+# Generated by Django 3.2.7 on 2025-01-13 13:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('course', '0005_participant_unread_messages_count'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='lesson',
+            name='content_type',
+            field=models.CharField(choices=[('youtube_link', 'Youtube Link'), ('video_file', 'Video File'), ('audio_file', 'Audio File')], max_length=50, verbose_name='Content Type'),
+        ),
+        migrations.AlterField(
+            model_name='lesson',
+            name='video_link',
+            field=models.CharField(blank=True, max_length=500, null=True, verbose_name='Link'),
+        ),
+    ]
diff --git a/apps/course/models/lesson.py b/apps/course/models/lesson.py
index 64b9d4f..d300dfc 100644
--- a/apps/course/models/lesson.py
+++ b/apps/course/models/lesson.py
@@ -16,21 +16,22 @@ def lesson_file_upload_to(instance, filename):
 
 class Lesson(models.Model):
     class ContentTypeChoices(models.TextChoices):
-        LINK = 'link', 'Link'
-        FILE = 'file', 'File'
+        YOUTUBE_LINK = 'youtube_link', 'Youtube Link'
+        VIDEO_FILE = 'video_file', 'Video File'
+        AUDIO_FILE = 'audio_file', 'Audio File'
 
     course = models.ForeignKey("course.Course", on_delete=models.CASCADE, related_name='lessons', verbose_name='Course')
     title = models.CharField(max_length=255, verbose_name='Lesson Title')
     priority = models.IntegerField(null=True, blank=True, verbose_name='Priority')
     is_active = models.BooleanField(default=True, verbose_name=_('Is Active'))
     duration = models.PositiveIntegerField(verbose_name='Duration (in minutes)')
-    content_type = models.CharField(max_length=10, choices=ContentTypeChoices.choices, verbose_name='Content Type')
+    content_type = models.CharField(max_length=50, choices=ContentTypeChoices.choices, verbose_name='Content Type')
     content_file = models.FileField(
         null=True,
         blank=True,
         upload_to=lesson_file_upload_to,
     )
-    video_link = models.CharField(max_length=500, null=True, blank=True, verbose_name='Video Link')
+    video_link = models.CharField(max_length=500, null=True, blank=True, verbose_name='Link')
 
     created_at = models.DateTimeField(auto_now_add=True, verbose_name=_("Created at"))
     updated_at = models.DateTimeField(auto_now=True, verbose_name=_("Updated At"))
diff --git a/apps/course/views/lesson.py b/apps/course/views/lesson.py
index 9941f93..7492fa1 100644
--- a/apps/course/views/lesson.py
+++ b/apps/course/views/lesson.py
@@ -86,6 +86,22 @@ class LessonDetailView(RetrieveAPIView):
 class LessonCompletionCreateAPIView(GenericAPIView):
     permission_classes = [IsAuthenticated]
 
+
+    @swagger_auto_schema(
+        request_body=openapi.Schema(
+            type=openapi.TYPE_OBJECT,
+            required=['lesson_id'],
+            properties={
+                'lesson_id': openapi.Schema(type=openapi.TYPE_INTEGER, description='ID of the lesson to be marked as completed'),
+            },
+        ),
+        responses={
+            201: 'Lesson completed successfully.',
+            200: 'Lesson already completed.',
+            400: 'Lesson ID is required.',
+            404: 'Lesson not found.',
+        }
+    )
     def post(self, request):
         student = request.user  # Assuming the user is the student
         lesson_id = request.data.get('lesson_id')