diff --git a/packaging/PKGBUILD b/packaging/PKGBUILD
index b75f03d..f5fde21 100644
--- a/packaging/PKGBUILD
+++ b/packaging/PKGBUILD
@@ -37,6 +37,14 @@ package() {
     install -Dm644 "packaging/paris.tourolle.darkroom.desktop" \
         "${pkgdir}/usr/share/applications/paris.tourolle.darkroom.desktop"
 
+    # The same AppStream file the Flatpak installs, so a software centre
+    # describes the two packages identically instead of falling back to the
+    # desktop entry's one-line Comment for this one. Installed here rather than
+    # written twice: the description, the licence fields and the OARS rating
+    # are facts about the application, not about how it was packaged.
+    install -Dm644 "packaging/paris.tourolle.darkroom.metainfo.xml" \
+        "${pkgdir}/usr/share/metainfo/paris.tourolle.darkroom.metainfo.xml"
+
     # The icon's *name* is the contract, not its path: the desktop entry says
     # `Icon=paris.tourolle.darkroom` and the compositor resolves that through
     # the hicolor theme. Installed under 256x256 because that is the source's
diff --git a/packaging/paris.tourolle.darkroom.metainfo.xml b/packaging/paris.tourolle.darkroom.metainfo.xml
new file mode 100644
index 0000000..864c662
--- /dev/null
+++ b/packaging/paris.tourolle.darkroom.metainfo.xml
@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Copyright 2026 Duncan Tourolle -->
+<component type="desktop-application">
+  <!--
+    The component id, the .desktop basename and the Flatpak application id are
+    one string, not three that happen to agree. `dr_ui::run` sets the same
+    string as the Wayland app_id and winit's WM_CLASS, so a rename that misses
+    one of them costs the icon in the shell, the association in the software
+    centre, or both, and neither failure names itself.
+  -->
+  <id>paris.tourolle.darkroom</id>
+
+  <!--
+    Two licence fields, two different things, and they are meant to differ.
+    `metadata_license` covers *this file* — software centres redistribute and
+    reformat catalogue metadata, so it has to be under something that permits
+    that unconditionally, which GPLv3 does not. `project_license` is the
+    application's own licence and is the one that must read GPL-3.0-or-later
+    to match D8 and the workspace manifest.
+  -->
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>GPL-3.0-or-later</project_license>
+
+  <name>DarkRoom</name>
+  <summary>Non-destructive RAW photo library and editor</summary>
+
+  <description>
+    <p>
+      DarkRoom catalogues, culls and develops RAW photographs. Edits are stored
+      as a graph of operations beside the original rather than baked into it,
+      so every change stays reversible and the file the camera wrote is never
+      rewritten.
+    </p>
+    <p>
+      The library can live in a plain directory — a local disk, an external
+      drive, an NFS or SMB mount — or on a Nextcloud server, browsed and edited
+      without downloading whole RAW files first.
+    </p>
+    <p>Where it differs from the tools it sits beside:</p>
+    <ul>
+      <li>Culling shows the camera's embedded preview immediately and replaces it with a full render when one is ready, so moving to the next frame does not wait on a demosaic</li>
+      <li>Sidecars are the record of an edit; the catalog is a cache that can be deleted and rebuilt</li>
+      <li>The develop pipeline runs on the GPU through Vulkan, including drawn masks — a working Vulkan driver is required, not merely preferred, because there is no CPU renderer behind it</li>
+      <li>Faces are detected and grouped locally — nothing is uploaded to identify anybody</li>
+    </ul>
+  </description>
+
+  <launchable type="desktop-id">paris.tourolle.darkroom.desktop</launchable>
+  <provides>
+    <binary>darkroom-desktop</binary>
+  </provides>
+
+  <url type="homepage">https://gitea.tourolle.paris/dtourolle/DarkRoom</url>
+  <url type="bugtracker">https://gitea.tourolle.paris/dtourolle/DarkRoom/issues</url>
+  <url type="vcs-browser">https://gitea.tourolle.paris/dtourolle/DarkRoom</url>
+
+  <developer id="paris.tourolle">
+    <name>Duncan Tourolle</name>
+  </developer>
+
+  <categories>
+    <category>Graphics</category>
+    <category>Photography</category>
+  </categories>
+
+  <keywords>
+    <keyword>RAW</keyword>
+    <keyword>photography</keyword>
+    <keyword>develop</keyword>
+    <keyword>darkroom</keyword>
+    <keyword>catalog</keyword>
+  </keywords>
+
+  <!--
+    D15 decided the target devices are a 12-inch tablet and a desktop, with no
+    phone. Stating that here is what stops a software centre offering the
+    application on hardware the interface was never laid out for: the develop
+    view puts a photograph beside a parameter panel, and below roughly 768
+    logical pixels there is no arrangement of the two that is worth using.
+    `recommends` rather than `requires` for the input devices — touch alone is
+    usable, it is simply not what the sliders were designed around.
+  -->
+  <requires>
+    <display_length compare="ge">768</display_length>
+  </requires>
+  <recommends>
+    <control>pointing</control>
+    <control>keyboard</control>
+    <control>touch</control>
+  </recommends>
+
+  <content_rating type="oars-1.1"/>
+
+  <releases>
+    <release version="0.9.0" date="2026-08-29"/>
+  </releases>
+</component>