diff --git a/backend/community/serializers.py b/backend/community/serializers.py
index 7aa91c0..6dd079f 100644
--- a/backend/community/serializers.py
+++ b/backend/community/serializers.py
@@ -168,7 +168,10 @@ class AnnouncementSerializer(serializers.ModelSerializer):
 
 class AdminActivitySerializer(serializers.ModelSerializer):
     signup_form_config = serializers.JSONField(required=False)
-    description = serializers.CharField(style={'base_template': 'textarea.html'})
+    description = serializers.CharField(
+        style={'base_template': 'textarea.html'},
+        help_text="活动详情内容，支持 Markdown 格式。如果需要插入图片，请先调用媒体上传接口获取 URL。"
+    )
     
     class Meta:
         model = Activity
@@ -176,7 +179,10 @@ class AdminActivitySerializer(serializers.ModelSerializer):
         read_only_fields = ['author', 'created_at', 'current_signups']
 
 class AdminTopicSerializer(serializers.ModelSerializer):
-    content = serializers.CharField(style={'base_template': 'textarea.html'})
+    content = serializers.CharField(
+        style={'base_template': 'textarea.html'},
+        help_text="帖子内容，支持 Markdown 格式。如果需要插入图片，请先调用媒体上传接口获取 URL。"
+    )
 
     class Meta:
         model = Topic