diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..b19b9cf
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,110 @@
+# Changelog
+
+Notable changes to Strata. The format follows
+[Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and versions follow
+[Semantic Versioning](https://semver.org/). While the version is 0.x, a minor
+release may change behaviour.
+
+Add a line under **Unreleased** in the same PR as the change. Examiners read
+this list, so write for them: what changed in what Strata reads, reports or
+records, not how the code changed.
+
+## [Unreleased]
+
+## [0.1.0] - Unreleased
+
+The first release. Everything is described in the [README](README.md). In
+brief:
+
+### Evidence
+
+- EWF (`.E01`, `.L01`) including split segment sets; single-file raw/dd;
+  VMDK (flat, sparse and stream-optimized); VHDX (fixed and dynamic);
+  AccessData AD1.
+- Size and offset fields in EWF segment files are bounded, so a damaged
+  image records a finding instead of exhausting memory
+  ([#14](https://github.com/switch-nz/strata/pull/14)).
+- Logical evidence: a folder, a zip or a single file opened as an exhibit.
+- MBR and GPT volume layout, including damaged tables and the gaps between
+  partitions.
+- Stored acquisition hashes recovered and re-verifiable; EWF chunk
+  checksums checked as data is read.
+- BitLocker and LUKS1 unlock by password or recovery key, held for the
+  session only.
+
+### Filesystems
+
+- NTFS, FAT12/16/32, exFAT, ext2/3/4 with jbd2 journal recovery, APFS and
+  HFS+/HFSX, parsed directly, with deleted entries, file slack and
+  unallocated space reachable throughout.
+- A contiguous exFAT run that claims more than the cluster heap holds is cut
+  off at its end, with a finding
+  ([#17](https://github.com/switch-nz/strata/pull/17)).
+
+### Analysis
+
+- Sixteen artefact parsers with a triage set, including `$UsnJrnl`,
+  prefetch, LNK and Jump Lists, Recycle Bin, registry keys, shellbags,
+  Amcache and ShimCache, browser history, event logs and a timeline.
+- Registry hives with transaction-log replay and deleted key recovery.
+- SQLite (with deleted record recovery), ESE, LevelDB, PST, mbox, Office
+  documents, PDF, EXIF and cryptocurrency wallet material.
+- Literal and regex search with stated coverage; signature carving (29
+  built-in signatures); MD5, SHA-1 and SHA-256 hashing with hash sets;
+  ATT&CK tagging.
+
+### Interface and cases
+
+- Hex view with the core sample, data interpreter and structure templates;
+  directory listing and gallery; a preview pane that never executes active
+  content.
+- Six themes, including midnight, sepia and two high-contrast themes, chosen
+  from a theme picker dialog
+  ([#1](https://github.com/switch-nz/strata/pull/1),
+  [#9](https://github.com/switch-nz/strata/pull/9)).
+- Cases as folders with several exhibits and examiners, file extraction
+  with a hashed manifest, a self-contained HTML report and a hash-chained,
+  append-only audit log.
+
+### Project
+
+- CI on Linux, Windows and macOS across Python 3.8 to 3.13, with unit tests
+  and a smoke test of the running app; `SECURITY.md`, `CONTRIBUTING.md` and
+  issue templates ([#12](https://github.com/switch-nz/strata/pull/12)).
+- Parser tests built from synthetic images, mutation fuzzing of the parsers,
+  tests of the request gate, and CodeQL
+  ([#13](https://github.com/switch-nz/strata/pull/13)).
+
+### Not implemented
+
+EWF v2 (Ex01), split raw sets, FileVault, BitLocker with the Elephant
+diffuser, LUKS2 with Argon2, ANSI PST, `$LogFile`, carving across fragments,
+and opening shadow copies (they are listed only).
+
+### Known issues
+
+Corroborate results in these areas with another tool before relying on them.
+
+- **Some parsers return wrong or missing results without a warning**
+  ([#19](https://github.com/switch-nz/strata/issues/19)):
+  - exFAT timestamps ignore the recorded UTC offset but are labelled UTC.
+  - Files in the later clusters of a contiguous exFAT directory are not
+    listed.
+  - Sparse ext4 files read back with their data at the wrong offsets; ext4
+    inline files over 60 bytes, and inline directories, are misread.
+  - Deleted FAT long filenames made of several parts are assembled out of
+    order, and slack for a deleted multi-cluster FAT file is reported in the
+    wrong place.
+  - A truncated compressed EWF chunk is returned short, without a finding.
+  - Opening the first segment of a split raw set reads that segment alone,
+    with nothing to say the rest of the disk is missing. Join the segments
+    first.
+- A file with a three-letter extension beside an EWF image, such as
+  `case.txt` next to `case.E01`, is taken as a segment and stops the image
+  opening ([#19](https://github.com/switch-nz/strata/issues/19)).
+- Some damaged images crash or hang a parser instead of recording a finding
+  ([#15](https://github.com/switch-nz/strata/issues/15),
+  [#19](https://github.com/switch-nz/strata/issues/19)).
+
+[Unreleased]: https://github.com/switch-nz/strata/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/switch-nz/strata/releases/tag/v0.1.0
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b53ad06..e8647a5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,6 +20,9 @@ python3 run.py          # then open http://127.0.0.1:8722
   frontend, runs the cross-platform smoke matrix (which launches the real
   server), and runs the unit tests.
 - Keep the diff focused: one behaviour per PR, no drive-by reformatting.
+- **Note user-visible changes** under *Unreleased* in
+  [`CHANGELOG.md`](CHANGELOG.md), written for an examiner rather than a
+  developer.
 
 ## The rules that make this codebase what it is