diff --git a/app/routes/admin/sponsor.tsx b/app/routes/admin/sponsor.tsx
index 85b5529..05f9d6a 100644
--- a/app/routes/admin/sponsor.tsx
+++ b/app/routes/admin/sponsor.tsx
@@ -7,6 +7,7 @@ import { Button } from "~/components/ui/button";
 import { confirmSubmit, promptDialog } from "~/components/ui/dialog";
 import { Input } from "~/components/ui/input";
 import { Select } from "~/components/ui/select";
+import { Textarea } from "~/components/ui/textarea";
 import { UserAvatar } from "~/components/user-avatar";
 import { pageTitle } from "~/share-meta";
 import { fromWallClock, unixNow, wallClock } from "~/time";
@@ -58,7 +59,8 @@ const DONE: Record<string, string> = {
   confirm: "已确认",
   amount: "已修改金额",
   reject: "已标为未收到",
-  message: "已删除留言",
+  message: "已保存留言",
+  anonymous: "已修改",
   delete: "已删除",
 };
 
@@ -100,7 +102,9 @@ export async function action({ request, context }: Route.ActionArgs) {
                     ? { amount: fen() }
                     : intent === "reject"
                       ? { status: "rejected", reason: field("reason") }
-                      : { message: null },
+                      : intent === "anonymous"
+                        ? { anonymous: field("anonymous") === "on" }
+                        : { message: field("message") },
             });
   if (res.ok) return { intent, ok: true, message: DONE[intent] ?? "已保存" };
   return { intent, ok: false, message: (await res.json()).error.message };
@@ -213,20 +217,39 @@ function Row({ item: r }: { item: Item }) {
           </>
         )}
       </p>
-      {r.message && (
-        <p className="mt-2 rounded-xl bg-secondary/50 px-3 py-2 text-sm break-words">{r.message}</p>
-      )}
+      {/* Saved empty, the message is taken down. The boxes are keyed by what's saved, so a change
+          from anywhere replaces what they hold; they are off while one is sent, or what is typed
+          meanwhile would be replaced too. */}
+      <Form method="post" className="mt-2 flex items-start gap-2">
+        <input type="hidden" name="id" value={r.id} />
+        <Textarea
+          key={r.message ?? ""}
+          name="message"
+          aria-label="留言"
+          placeholder="无留言"
+          defaultValue={r.message ?? ""}
+          maxLength={MAX_MESSAGE}
+          disabled={busy}
+          className="min-h-0 flex-1"
+        />
+        <Button name="intent" value="message" size="sm" variant="outline" disabled={busy}>
+          保存留言
+        </Button>
+      </Form>
       {r.status === "rejected" && r.reason && (
         <p className="mt-2 text-meta text-muted-foreground">理由：{r.reason}</p>
       )}
       <Form method="post" className="mt-3 flex flex-wrap items-center gap-2">
         <input type="hidden" name="id" value={r.id} />
+        <input type="hidden" name="anonymous" value={r.anonymous ? "" : "on"} />
         <span className="flex items-center gap-1.5 text-sm">
           实收 ¥
           <Input
+            key={r.amount}
             {...AMOUNT_INPUT}
             aria-label="实收金额"
             defaultValue={yuan(r.amount)}
+            disabled={busy}
             className="w-24"
           />
         </span>
@@ -250,18 +273,20 @@ function Row({ item: r }: { item: Item }) {
             {confirmed ? "撤销确认" : "未收到"}
           </Button>
         )}
-        {r.message && (
-          <Button
-            name="intent"
-            value="message"
-            size="sm"
-            variant="ghost"
-            disabled={busy}
-            onClick={confirmSubmit("确定删除这条留言？删除后无法恢复。", "删除")}
-          >
-            删除留言
-          </Button>
-        )}
+        <Button
+          name="intent"
+          value="anonymous"
+          size="sm"
+          variant="outline"
+          disabled={busy}
+          onClick={
+            r.anonymous
+              ? confirmSubmit("确定在感谢墙上显示 TA 的名字？请先确认是本人的意思。", "显示名字")
+              : undefined
+          }
+        >
+          {r.anonymous ? "显示名字" : "改为匿名"}
+        </Button>
         <Button
           name="intent"
           value="delete"
diff --git a/docs/api.md b/docs/api.md
index c132cfd..03907be 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -391,7 +391,7 @@ token 由站长在后台创建，只显示一次。每个 token 绑定一个 bot
 | GET | `/admin/sponsorships` | 赞助记录（总体设计 §8.21），每页 30 条：`status`（默认 `pending`；`confirmed`、`rejected`）、`cursor`；待确认的先登记的在前，其余最近登记的在前。每条同 `/me/sponsorships`，另带 `user`（匿名的也给，带 `qq`）、`reviewer`、`reviewed_at`、`created_at` | 站长、收款人（须是未冻结的管理员），只能在网页上操作 |
 | GET | `/admin/sponsorships/count` | 待确认的赞助有几条：`{ count }`，后台的菜单上显示 | 站长、收款人（须是未冻结的管理员），只能在网页上操作 |
 | POST | `/admin/sponsorships` | 补录：`{ user, method, amount, paid_at, message }`，`paid_at` 不能晚于现在；直接是已确认，匿名；本人收到通知。返回这条记录 | 站长、收款人（须是未冻结的管理员），只能在网页上操作 |
-| PATCH | `/admin/sponsorships/{id}` | 只改带了的字段：`status`（`confirmed` 确认，`rejected` 没收到或撤销确认，可附 `reason`，最多 200 个字）、`amount`、`message`（只能为 `null`，删除留言）。状态变了时本人收到通知 | 站长、收款人（须是未冻结的管理员），只能在网页上操作 |
+| PATCH | `/admin/sponsorships/{id}` | 只改带了的字段：`status`（`confirmed` 确认，`rejected` 没收到或撤销确认，可附 `reason`，最多 200 个字）、`amount`、`anonymous`（感谢墙上是否匿名）、`message`（新的留言，最多 50 个字；为 `null` 或空时删除留言）。状态变了时本人收到通知 | 站长、收款人（须是未冻结的管理员），只能在网页上操作 |
 | DELETE | `/admin/sponsorships/{id}` | 删掉记错的赞助记录 | 站长、收款人（须是未冻结的管理员），只能在网页上操作 |
 | DELETE | `/admin/archive-flags/{id}` | 处理完一层的反馈，`id` 是楼层的 ID：清掉它收到的全部反馈，楼层要隐藏的另外用 `PATCH`；没有反馈返回 `404 archive_flags_not_found`；记操作日志 | 版主 / `moderate` |
 | GET | `/admin/suggestions` | 待处理的修改建议，最新的在前，每页 30 条：`cursor`（上一页最后一条的 ID）；每条同 `GET /threads/{id}` 的 `suggestions`，另带帖子现在的 `thread`（`id`、`title`、`board`、`tags`）。帖子删了的不列 | 版主 / `moderate` |
diff --git a/docs/design.md b/docs/design.md
index 4733c37..8504415 100644
--- a/docs/design.md
+++ b/docs/design.md
@@ -819,7 +819,7 @@ QQ 群的 2000 人规模、服务器、域名和 bot 用的模型都要花钱，
   - 付了没登记的、以前赞助过的，收款人或站长补录一条，直接是已确认，默认匿名；本人收到通知，可以自己改成显示名字。
   - 只通知收款人，不催赞助的人，登记了没付的也不提醒。站长不收通知，看后台菜单上标出的待确认条数。
 - **感谢墙**：只列确认过的，最近登记的在前，排成多列错落的便签。每张是档位名、留言、名字（匿名的显示"匿名鼠鼠"）和日期，不显示金额，免得互相比。档位越高底色越暖，旁边画一周七个点，亮几个是几天。档位按金额算：¥24 起是一周，¥14 起是 4 天，¥7 起是 2 天，不到 ¥7 的显示"一份心意"。设了"我的内容不给访客看"的人，访客看不到 TA 的那一张（第 8.10 节）。
-- **改记录**：本人随时可以改匿名、删除留言；留言不能改，待确认的要改就撤回重新登记，这样公开的留言都经收款人看过。收款人和站长可以改金额、删除留言，也可以删除记错的记录。金额只有本人、收款人和站长看得到。这些改动都记操作日志。
+- **改记录**：本人随时可以改匿名、删除留言，但不能改留言：待确认的要改就撤回重新登记，上了墙的找收款人改，这样公开的留言都经收款人看过。收款人和站长可以改金额、改留言（清空即删除）、改是否匿名（改成显示名字前先确认是本人的意思），也可以删除记错的记录。金额只有本人、收款人和站长看得到。这些改动都记操作日志。
 - **徽章**：有一笔确认过、不匿名的赞助，得到铜徽章「投喂鼠」（第 8.8 节）；匿名的不算，否则从徽章看得出匿名的是谁。
 
 ## 9. 页面
diff --git a/server/modules/sponsors/routes.test.ts b/server/modules/sponsors/routes.test.ts
index e087188..782e002 100644
--- a/server/modules/sponsors/routes.test.ts
+++ b/server/modules/sponsors/routes.test.ts
@@ -33,7 +33,15 @@ async function register(who: Who, amount = 700, anonymous = false) {
   return (await res.json()).id;
 }
 
-function review(id: number, json: { status?: "confirmed" | "rejected"; amount?: number }) {
+function review(
+  id: number,
+  json: {
+    status?: "confirmed" | "rejected";
+    amount?: number;
+    anonymous?: boolean;
+    message?: string | null;
+  },
+) {
   return api.admin.sponsorships[":id"].$patch({ param: { id: String(id) }, json }, payee.who);
 }
 
@@ -167,6 +175,25 @@ describe("登记和确认", () => {
     expect(late.status).toBe(409);
   });
 
+  test("收款人可以改墙上的留言，清空就删掉", async () => {
+    const someone = await member();
+    const id = await register(someone.who);
+    await review(id, { status: "confirmed" });
+    expect((await review(id, { message: "  祝大家都上岸  " })).status).toBe(204);
+    expect((await wall()).find((t) => t.id === id)).toMatchObject({ message: "祝大家都上岸" });
+    await review(id, { message: "" });
+    expect((await wall()).find((t) => t.id === id)).toMatchObject({ message: null });
+  });
+
+  test("收款人可以改是否匿名", async () => {
+    const someone = await member();
+    const id = await register(someone.who, 700, true);
+    await review(id, { status: "confirmed" });
+    expect((await wall()).find((t) => t.id === id)).toMatchObject({ user: null });
+    expect((await review(id, { anonymous: false })).status).toBe(204);
+    expect((await wall()).find((t) => t.id === id)).toMatchObject({ user: { id: someone.id } });
+  });
+
   test("没收到的附理由通知本人，不上墙", async () => {
     const someone = await member();
     const id = await register(someone.who);
diff --git a/server/modules/sponsors/routes.ts b/server/modules/sponsors/routes.ts
index 8018f0f..5fcfd89 100644
--- a/server/modules/sponsors/routes.ts
+++ b/server/modules/sponsors/routes.ts
@@ -441,7 +441,10 @@ export const sponsorsRoutes = createRouter()
                   .transform((r) => r || null)
                   .openapi({ description: "标为没收到的理由" }),
                 amount: Amount.optional(),
-                message: z.null().optional().openapi({ description: "为 null 时删掉留言" }),
+                anonymous: z.boolean().optional().openapi({ description: "感谢墙上是否匿名" }),
+                message: Message.optional().openapi({
+                  description: `新的留言，最多 ${MAX_MESSAGE} 个字；为 null 或空时删掉留言`,
+                }),
               }),
             },
           },
diff --git a/server/modules/sponsors/service.ts b/server/modules/sponsors/service.ts
index 2576cbd..351930a 100644
--- a/server/modules/sponsors/service.ts
+++ b/server/modules/sponsors/service.ts
@@ -149,8 +149,8 @@ async function lockOne(trx: Transaction<DB>, id: number) {
   );
 }
 
-// Whoever paid may go anonymous or not at any time, and take the message down; one shown on the
-// wall was read by the payee when confirming it, so it can't be changed afterwards.
+// Whoever paid may go anonymous or not at any time, and take the message down, but not reword it:
+// every message on the wall is one the payee has read, so corrections go through the payee.
 export async function editOwnSponsorship(
   actor: Actor,
   id: number,
@@ -219,8 +219,8 @@ export async function addSponsorship(
   });
 }
 
-// Confirmed with what really came, turned down with why, a confirmation taken back, or a message
-// taken down. Whoever paid hears when its status changes.
+// Confirmed with what really came, turned down with why, a confirmation taken back, the message
+// corrected or taken down, or anonymity set right. Whoever paid hears when its status changes.
 export async function reviewSponsorship(
   actor: Actor,
   id: number,
@@ -228,7 +228,8 @@ export async function reviewSponsorship(
     status?: "confirmed" | "rejected";
     reason?: string | null;
     amount?: number;
-    message?: null;
+    anonymous?: boolean;
+    message?: string | null;
   },
 ) {
   await db.transaction().execute(async (trx) => {
@@ -249,6 +250,7 @@ export async function reviewSponsorship(
       .updateTable("sponsorships")
       .set({
         amount: after.amount,
+        anonymous: after.anonymous,
         message: after.message,
         status: after.status,
         reason: after.reason,
@@ -273,7 +275,13 @@ export async function reviewSponsorship(
         amount: after.amount,
         ...(rest.amount !== undefined &&
           rest.amount !== before.amount && { amount_was: before.amount }),
-        ...(rest.message === null && before.message !== null && { message_was: before.message }),
+        ...(rest.anonymous !== undefined &&
+          rest.anonymous !== before.anonymous && { anonymous: after.anonymous }),
+        ...(rest.message !== undefined &&
+          rest.message !== before.message && {
+            message: after.message,
+            message_was: before.message,
+          }),
         ...(reviewed && { status_was: before.status, reason: after.reason }),
       },
     });