diff --git a/.gitignore b/.gitignore
index ea9df61..233c77d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,6 @@
 /mkosi-17.1.tar.gz
 /mkosi-18.tar.gz
 /mkosi-19.tar.gz
+/mkosi-20.tar.gz
+/mkosi-20.1.tar.gz
+/mkosi-21.tar.gz
diff --git a/mkosi.spec b/mkosi.spec
index 6aae18d..c44b8af 100644
--- a/mkosi.spec
+++ b/mkosi.spec
@@ -1,5 +1,5 @@
 Name:           mkosi
-Version:        19
+Version:        21
 Release:        1.1%{?dist}
 Summary:        Create bespoke OS images
 
@@ -88,11 +88,29 @@ Recommends:     zstd
 Recommends:     xz
 
 %description
-A fancy wrapper around "dnf --installroot", "apt-get", "pacman", "zypper", and
-"emerge" to generate disk images with a number of bells and whistles.
+A fancy wrapper around "dnf --installroot", "apt", "pacman", and "zypper" that
+generates disk images with a number of bells and whistles.
 
-Generated images are tailored to the purpose. This means GPT disk labels are
-used and only systemd-based images may be generated.
+Generated images are tailored to the purpose: GPT partitions,
+systemd-boot or grub2, images for containers, VMs, initrd, and extensions.
+
+Mkosi can boot an image via QEMU or systemd-nspawn, or simply start a shell in
+chroot, burn the image to a device, connect to a running VM via ssh, extract
+logs and coredumps, and also serve an image over HTTP.
+
+See https://mkosi.systemd.io/ for documentation.
+
+%package initrd
+Summary:       Build initrds locally using mkosi
+Requires:      %{name} = %{version}-%{release}
+Requires:      (dnf5 or dnf)
+
+%description initrd
+This package provides the plugin for kernel-install to build initrds with
+mkosi locally.
+
+After the package is installed, the plugin can be enabled by writing
+'initrd_generator=mkosi-initrd' to '/etc/kernel/install.conf'.
 
 %prep
 %autosetup -p1
@@ -113,12 +131,23 @@ mkdir -p %{buildroot}%{_mandir}/man1
 ln -s -t %{buildroot}%{_mandir}/man1/ \
          ../../../..%{python3_sitelib}/mkosi/resources/mkosi.1
 
+# Install the kernel-install plugin
+install -Dt %{buildroot}%{_prefix}/lib/kernel/install.d/ \
+         kernel-install/50-mkosi.install
+mkdir -p %{buildroot}%{_prefix}/lib/mkosi-initrd
+mkdir -p %{buildroot}%{_sysconfdir}/mkosi-initrd
+
 %files -f %pyproject_files
 %license LICENSE
 %doc README.md
 %_bindir/mkosi
 %_mandir/man1/mkosi.1*
 
+%files initrd
+%_prefix/lib/kernel/install.d/50-mkosi.install
+%ghost %dir %{_prefix}/lib/mkosi-initrd
+%ghost %dir %{_sysconfdir}/mkosi-initrd
+
 %check
 %if %{with tests}
 %pytest tests/ -v
diff --git a/sources b/sources
index 4923144..f7968d5 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (mkosi-19.tar.gz) = 8eb4e4af823299fdd6e9a077ec27be029656974ba0414b08ef226b5ccf7cd0a92d8bef4e475cdf05b86c3a0027c43be0f895af56a87df22502d2904cb0246ef4
+SHA512 (mkosi-21.tar.gz) = b08a15961aefa792cc54c67943761cb49c291aed80fcc7ecaa09e434f5df22793f9eae0850d373d899d052c800e4eb3461a74169f40662bbee0ae20e2d89bc0c