diff --git a/RELEASE.md b/RELEASE.md
index fff6c05e..f5dc606a 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -11,3 +11,23 @@ For example, to release version 1.13.0 of chatmail relay, do the following steps
 4. Open a PR with the new commit, merge it to main after review.
 
 5. In the web interface, create a GitHub release, tell it to create a new tag.
+
+## Releasing filtermail
+
+filtermail is versioned independently and released from the same repo,
+using `filtermail-` prefixed tags. To release filtermail 0.7.5:
+
+1. Switch to `filtermail/` directory: `cd filtermail`
+
+2. Update the changelog:
+   `git cliff u -t filtermail-0.7.5 -p CHANGELOG.md`
+
+3. Bump `version` in `Cargo.toml` and commit `Cargo.lock`.
+
+4. Commit with the message: `feat(release): prepare filtermail for 0.7.5`
+
+5. Open a PR with the new commit, merge it to main after review.
+
+6. In the web interface, create a GitHub release, tell it to create a new tag `filtermail-0.7.5`. Do not push the tag by hand: the release must exist before the upload job runs.
+
+7. Bump the pinned version and sha256sums in `cmdeploy/src/cmdeploy/filtermail/deployer.py`.