diff --git a/README.md b/README.md
index aec4042..3d91f35 100644
--- a/README.md
+++ b/README.md
@@ -168,8 +168,8 @@ One tag releases pine and spruce together. Write the release notes for the two p
 Commit the notes and push them to `main`. Then use the release script.
 
 ```sh
-${EDITOR:-vi} docs/releases/v0.8.0.md
-./scripts/release.sh v0.8.0
+${EDITOR:-vi} docs/releases/v0.8.1.md
+./scripts/release.sh v0.8.1
 ```
 
 When the script publishes the GitHub Release, the `Release` workflow builds the two programs for Linux, macOS, and Windows. It attaches one archive for each program and each system to the release.
diff --git a/docs/releases/v0.8.1.md b/docs/releases/v0.8.1.md
new file mode 100644
index 0000000..0c26229
--- /dev/null
+++ b/docs/releases/v0.8.1.md
@@ -0,0 +1,132 @@
+# pine and spruce v0.8.1
+
+This release corrects nine faults in the progress sync of pine. The progress
+sync sends the position and the listening time to the Audiobookshelf server.
+spruce has no change.
+
+## Installation
+
+```sh
+go install github.com/Thelost77/pine@v0.8.1
+go install github.com/Thelost77/pine/cmd/spruce@v0.8.1
+```
+
+As an alternative, download an archive from the release page. See "Binaries".
+
+## Binaries
+
+The release has one archive for each program and each system. The name of an
+archive is `<program>_v0.8.1_<system>_<architecture>`:
+
+| System | Architecture | File type |
+|--------|--------------|-----------|
+| `linux` | `amd64`, `arm64` | `.tar.gz` |
+| `darwin` (macOS) | `amd64`, `arm64` | `.tar.gz` |
+| `windows` | `amd64` | `.zip` |
+
+Each archive contains the program, the `LICENSE` file of pine, and a `licenses`
+directory. That directory has the license texts of Go and of the modules that
+the program links.
+
+- A binary needs libmpv. See "Requirements".
+- On Windows, put `libmpv-2.dll` in the directory of the program. The archive
+  does not contain it.
+- The binaries are not signed.
+- A GitHub Actions workflow builds the binaries on Linux with `CGO_ENABLED=0`.
+  No binary of this release has run on a test machine.
+
+## pine
+
+### Reliability and Correctness
+
+Finished items:
+
+* **A stop removed the finished mark of the last finished item.** pine restores
+  the last session at each start. For a finished item, that session starts at
+  the position 0. A quit, or the play of a different item, then told the server
+  that the item is not finished. pine now sends no progress for a session with
+  no new position and no listening time, and it closes that session with no
+  position.
+* **The end of a book could lose its finished mark.** At the end of a book,
+  pine sent the last position with the value "not finished". If the server
+  handled the close of the session first, it marked the book as finished. The
+  progress update then removed the mark, and the server stored the position 0.
+  A stop now sends the position with no finished value, and the server applies
+  its own rule. Only "mark as finished" and "mark as not finished" send the
+  value.
+
+Listening time:
+
+* **Each sync sent the total listening time of the session.** pine sends a
+  sync each 30 seconds, and the server adds the listening time of each sync.
+  For one hour of play, the server stored about 61 hours. A sync now sends
+  only the listening time that the server does not have.
+* **The listening time was the change of the position.** At the speed 2.0, one
+  hour of play counted as two hours. The listening time is now the time of the
+  clock while the player plays. A pause adds nothing.
+* **A quit with ctrl+c sent the last listening time two times.** pine sent the
+  close of the session and the progress update two times. pine now sends them
+  one time.
+
+Position:
+
+* **A paused session sent a sync each 30 seconds.** The server stored the old
+  position again. That could replace a newer position from a second device.
+  pine now sends a sync only if the position or the listening time has a
+  change of 1 second or more.
+* **A quit with `q` could lose the last position and the listening time.** The
+  program could end before the two requests left. pine now sends the two
+  requests and waits for the server before it ends.
+
+Sessions:
+
+* **Each sync failed after the server lost the session.** Audiobookshelf has
+  no open session after a restart, or after 36 hours with no change of the
+  session. pine wrote a log line and continued. The server stored no listening
+  time for the rest of the playback, and it stored the position only at the
+  stop. pine now opens a new session for the item, and sends the position and
+  the listening time to it.
+* **The close of a session could fail at the play of a different item.** pine
+  sent the close of the old session and the play request at the same time. The
+  server closes the old session at a play request, and it then refused the
+  close of pine. The listening time of that close was lost. pine now waits for
+  the close before it sends the play request.
+
+### Changes of Behavior
+
+* A quit waits until the server has the last position. If the server does not
+  answer, a quit can take up to 5 seconds. Before, a quit with `q` ended
+  immediately.
+* The play of a different item waits for the close of the old session. If the
+  server does not answer, the wait ends after 10 seconds.
+* The listening time that pine sends is lower than before, because the old
+  values were too high. This release does not correct the values that the
+  server has.
+* A position tick that comes more than 5 seconds after the last tick adds no
+  listening time, for example after a suspend of the machine. One pause can
+  lose up to 1 second of listening time.
+
+## spruce
+
+spruce has no change in this release. The changed packages, `internal/abs` and
+`internal/app`, are part of pine only.
+
+## Development
+
+* Each correction has a test that failed before the correction. The tests use
+  a fake Audiobookshelf server and the mock player of the app tests.
+* No real Audiobookshelf server ran for these corrections, and no real
+  playback ran. The statements about Audiobookshelf are from the source of
+  version 2.37.1.
+* No quit ran in a real terminal, and no playback ran at a speed other than
+  1.0.
+* The position that libmpv reports for a paused session is not measured. If it
+  is 1 second or more from the start position of the session, a stop sends
+  that position, with no finished value.
+
+## Requirements
+
+- Go 1.26.4 or newer, for an installation from source
+- libmpv from [mpv](https://mpv.io/) 0.34 or later
+- pine: an [Audiobookshelf](https://www.audiobookshelf.org/) server
+- spruce: a [Jellyfin](https://jellyfin.org/) account with a music library
diff --git a/docs/spruce/README.md b/docs/spruce/README.md
index de1df9d..849bc00 100644
--- a/docs/spruce/README.md
+++ b/docs/spruce/README.md
@@ -191,7 +191,7 @@ Commit the notes and all release changes. Push them to `main`. Then use the
 release script:
 
 ```sh
-./scripts/release.sh v0.8.0
+./scripts/release.sh v0.8.1
 ```
 
 The script verifies the repository, creates and pushes the exact annotated tag,