diff --git a/nonebot_bison/sub_manager/add_cookie.py b/nonebot_bison/sub_manager/add_cookie.py
index 28f54b6..61cdcd6 100644
--- a/nonebot_bison/sub_manager/add_cookie.py
+++ b/nonebot_bison/sub_manager/add_cookie.py
@@ -55,7 +55,9 @@ def do_add_cookie(add_cookie: type[Matcher]):
         cookie_site = cast(type[CookieSite], platform_manager[state["platform"]].site)
         cookie_text = cookie.extract_plain_text()
         if not await cookie_site.validate_cookie(cookie_text):
-            await add_cookie.reject(state["site"].cookie_format_prompt)
+            await add_cookie.reject(
+                "无效的 Cookie，请检查后重新输入，详情见https://nonebot-bison.netlify.app/usage/cookie.html"
+            )
         state["cookie"] = cookie_text
 
     @add_cookie.handle()
diff --git a/nonebot_bison/utils/site.py b/nonebot_bison/utils/site.py
index 9a042f2..d975f93 100644
--- a/nonebot_bison/utils/site.py
+++ b/nonebot_bison/utils/site.py
@@ -166,7 +166,6 @@ class Site(metaclass=RegistryMeta, base=True):
 
 class CookieSite(Site):
     client_mgr: type[CookieClientManager] = CookieClientManager
-    cookie_format_prompt = "无效的 Cookie，请检查后重新输入，详情见<待添加的文档>"
 
     @classmethod
     async def get_cookie_name(cls, content: str) -> str:
diff --git a/tests/sub_manager/test_add_cookie.py b/tests/sub_manager/test_add_cookie.py
index 62b39c0..8aea570 100644
--- a/tests/sub_manager/test_add_cookie.py
+++ b/tests/sub_manager/test_add_cookie.py
@@ -126,7 +126,11 @@ async def test_add_cookie(app: App):
                 message=Message("test"), sender=fake_superuser, to_me=True, user_id=fake_superuser.user_id
             )
             ctx.receive_event(bot, event_4_err)
-            ctx.should_call_send(event_4_err, "无效的 Cookie，请检查后重新输入，详情见<待添加的文档>", True)
+            ctx.should_call_send(
+                event_4_err,
+                "无效的 Cookie，请检查后重新输入，详情见https://nonebot-bison.netlify.app/usage/cookie.html",
+                True,
+            )
             ctx.should_rejected()
             event_4_ok = fake_private_message_event(
                 message=Message(json.dumps({"cookie": "test"})),