diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cd6d4e7..5c30766 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -182,3 +182,26 @@ jobs:
             exit 1
           fi
           echo "ok: no trailing whitespace"
+
+      - name: Release notes are collapsed and bilingual
+        run: |
+          set -eu
+          # Every note ships closed behind 中文说明 / English, so the download links stay
+          # above the fold. v0.3.13 was written as one flat file and published that way:
+          # the shape is written down in docs/RELEASING.md and applied by
+          # tools/collapse-release-notes.py, so this step exists to catch the next time
+          # somebody (or some agent) forgets to run it.
+          bad=0
+          for f in docs/releases/*.md; do
+            [ -e "$f" ] || continue
+            if ! grep -q '<summary><h3>中文说明</h3></summary>' "$f"; then
+              echo "::error file=$f::missing the closed 中文说明 block"
+              bad=1
+            fi
+            if ! grep -q '<summary><h3>English</h3></summary>' "$f"; then
+              echo "::error file=$f::missing the closed English block"
+              bad=1
+            fi
+          done
+          [ "$bad" -eq 0 ]
+          echo "ok: release notes are collapsed"
diff --git a/docs/releases/v0.3.13.md b/docs/releases/v0.3.13.md
index d29cdd7..da9ba7a 100644
--- a/docs/releases/v0.3.13.md
+++ b/docs/releases/v0.3.13.md
@@ -1,11 +1,12 @@
-# CubSync 0.3.13
+<details>
+<summary><h3>中文说明</h3></summary>
 
-## 下载
+#### 下载
 
 - **Windows**：`CubSync-0.3.13.msi`（安装）或 `cubsync-0.3.13-windows.zip`（解压即用）
 - **Android**：`cubsync-0.3.13-android.apk`
 
-## 这一版修好的
+#### 这一版修好的
 
 **桌面**
 
@@ -32,21 +33,22 @@
 - 在远端栏输入对面机器的绝对路径时，如果该路径不在对面共享范围内，会直接列出对面共享了哪些目录，而不是报「读不了这个文件夹」。
 - 「本机」统一改称「本端」——远端可以是另一台电脑、另一块硬盘，或者以后的 WebDAV / FTP。「账户」一栏按协议列出每一端。
 
-## 仍然没有的
+#### 仍然没有的
 
 - **Root / Shizuku** 两种运行模式还只是记录设置：它们需要一个走 `su` 或 Shizuku 的独立后端，本版没有。选了会如实说明，不会假装生效。
 - **WebDAV / FTP / SFTP / SMB** 这些远端协议尚未实现；收藏夹的归类已经按协议留好位置。
 
----
+</details>
 
-# CubSync 0.3.13
+<details>
+<summary><h3>English</h3></summary>
 
-## Downloads
+#### Downloads
 
 - **Windows**: `CubSync-0.3.13.msi`, or `cubsync-0.3.13-windows.zip` to run without installing
 - **Android**: `cubsync-0.3.13-android.apk`
 
-## Fixed
+#### Fixed
 
 **Desktop**
 
@@ -83,8 +85,10 @@
 - 本机 is now 本端 throughout: the far end may be another computer, another disk, or a WebDAV / FTP
   mount later. 账户 lists each end with its protocol.
 
-## Still missing
+#### Still missing
 
 - **Root / Shizuku** run modes only record a setting: both need a backend that speaks through `su`
   or Shizuku, and this build has none. Selecting them says so rather than pretending.
 - **WebDAV / FTP / SFTP / SMB** are not implemented; favourite grouping already has a place for them.
+
+</details>