diff --git a/README.md b/README.md
index 2077d49..b5b2980 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,507 @@ Provides community health files for the [@ergebnis](https://github.com/ergebnis)
 
 :bulb: Also see [GitHub Docs: Creating a default community health file](https://docs.github.com/en/github/building-a-strong-community/creating-a-default-community-health-file).
 
+## Composite Actions
+
+This repository provides the following composite actions:
+
+- [`ergebnis/.github/actions/composer/determine-cache-directory`](#composer-determine-cache-directory)
+- [`ergebnis/.github/actions/composer/determine-root-version`](#composer-determine-root-version)
+- [`ergebnis/.github/actions/composer/install`](#composer-install)
+- [`ergebnis/.github/actions/github/pull-request/add-assignee`](#github-pull-request-add-assignee)
+- [`ergebnis/.github/actions/github/pull-request/add-label-based-on-branch-name`](#github-pull-request-add-label-based-on-branch-name)
+- [`ergebnis/.github/actions/github/pull-request/approve`](#github-pull-request-approve)
+- [`ergebnis/.github/actions/github/pull-request/merge`](#github-pull-request-merge)
+- [`ergebnis/.github/actions/github/pull-request/request-review`](#github-pull-request-review)
+- [`ergebnis/.github/actions/github/release/create`](#github-release-create)
+
+### <a name="composer-determine-cache-directory"> `ergebnis/.github/actions/composer/determine-cache-directory`
+
+This action determines the cache directory for [`composer`](https://github.com/composer/composer) and exports it as [`COMPOSER_CACHE_DIR`](https://getcomposer.org/doc/03-cli.md#composer-cache-dir) environment variable.
+
+This is useful for caching dependencies installed with `composer` using [`actions/cache`](https://github.com/actions/cache).
+
+```yaml
+name: "Integrate"
+
+on:
+  pull_request: null
+  push:
+    branches:
+      - "main"
+
+jobs:
+  tests:
+    name: "Tests"
+
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v3.0.2"
+
+      - name: "Set up PHP"
+        uses: "shivammathur/setup-php@2.21.2"
+        with:
+          coverage: "none"
+          php-version: "8.1"
+
+      - name: "Determine composer cache directory"
+        uses: "ergebnis/.github/actions/composer/determine-cache-directory@1.5.1"
+
+      - name: "Cache dependencies installed with composer"
+        uses: "actions/cache@v3.0.8"
+        with:
+          path: "${{ env.COMPOSER_CACHE_DIR }}"
+          key: "composer-${{ hashFiles('composer.lock') }}"
+          restore-keys: "composer-"
+```
+
+For details, see [`actions/composer/determine-cache-directory/action.yaml`](actions/composer/determine-cache-directory/action.yaml).
+
+#### Inputs
+
+- `working-directory`, optional: The working directory to use. Defaults to `"'"."`.
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+- The `COMPOSER_CACHE_DIR` environment variable contains the path to the composer cache directory.
+
+### <a name="composer-determine-root-version"> `ergebnis/.github/actions/composer/determine-root-version`
+
+This action determines the composer root version and exports it as [`COMPOSER_ROOT_VERSION`](https://getcomposer.org/doc/03-cli.md#composer-root-version) environment variable.
+
+This is useful for a package that depends on itself, for example, [`phpunit/phpunit`](https://github.com/sebastianbergmann/phpunit/blob/802b91a979fb79f39ac8f87def3996913a7fef11/.github/workflows/ci.yml#L9-L10)
+
+```yaml
+name: "Integrate"
+
+on:
+  pull_request: null
+  push:
+    branches:
+      - "main"
+
+jobs:
+  tests:
+    name: "Tests"
+
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v3.0.2"
+
+      - name: "Set up PHP"
+        uses: "shivammathur/setup-php@2.21.2"
+        with:
+          coverage: "none"
+          php-version: "8.1"
+
+      - name: "Determine composer root version"
+        uses: "ergebnis/.github/actions/composer/determine-root-version@1.5.1"
+```
+
+For details, see [`actions/composer/determine-root-version/action.yaml`](actions/composer/determine-root-version/action.yaml).
+
+#### Inputs
+
+- `branch`, optional: The name of the branch, defaults to `"main"`.
+- `working-directory`, optional: The working directory to use, defaults to `"."`.
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+The `COMPOSER_ROOT_VERSION` environment variable contains the root version if it has been defined as `branch-alias` in `composer.json`.
+
+```json
+{
+  "extra": {
+    "branch-alias": {
+      "dev-main": "10.0-dev"
+    }
+  }
+}
+```
+
+### <a name="composer-install"> `ergebnis/.github/actions/composer/install`
+
+This action installs or updates dependencies with [`composer`](https://getcomposer.org/doc/03-cli.md#install-i).
+
+```yaml
+name: "Integrate"
+
+on:
+  pull_request: null
+  push:
+    branches:
+      - "main"
+
+jobs:
+  tests:
+    name: "Tests"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        dependencies:
+          - "lowest"
+          - "locked"
+          - "highest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v3.0.2"
+
+      - name: "Set up PHP"
+        uses: "shivammathur/setup-php@2.21.2"
+        with:
+          coverage: "none"
+          php-version: "8.1"
+
+      - name: "Determine composer cache directory"
+        uses: "ergebnis/.github/actions/composer/determine-cache-directory@1.5.1"
+
+      - name: "Cache dependencies installed with composer"
+        uses: "actions/cache@v3.0.8"
+        with:
+          path: "${{ env.COMPOSER_CACHE_DIR }}"
+          key: "composer-${{ matrix.dependencies }}-${{ hashFiles('composer.lock') }}"
+          restore-keys: "composer-${{ matrix.dependencies }}-"
+
+      - name: "Install ${{ matrix.dependencies }} dependencies with composer"
+        uses: "ergebnis/.github/actions/composer/install@1.5.1"
+        with:
+          dependencies: "${{ matrix.dependencies }}"
+```
+
+For details, see [`actions/composer/install/action.yaml`](actions/composer/install/action.yaml).
+
+#### Inputs
+
+- `dependencies`, optional: Which dependencies to install, one of `"lowest"`, `"locked"`, `"highest"`
+- `working-directory`, optional: The working directory to use, defaults to `"."`.
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+When `dependencies` is set to `"lowest"`, dependencies are installed in the directory specified by `working-directory` with
+
+```shell
+composer update --ansi --no-interaction --no-progress --prefer-lowest
+````
+When `dependencies` is set to `"locked"`, dependencies are installed in the directory specified by `working-directory` with
+
+```shell
+composer install --ansi --no-interaction --no-progress
+```
+
+When `dependencies` is set to `"highest"`, dependencies are installed in the directory specified by `working-directory` with
+
+```shell
+composer update --ansi --no-interaction --no-progress
+````
+
+### <a name="github-pull-request-add-assignee"> `ergebnis/.github/actions/github/pull-request/add-assignee`
+
+This action adds an assignee to a pull request.
+
+This is useful when you want to automatically merge a pull request, but prefer to assign a bot user beforehand.
+
+```yaml
+name: "Merge"
+
+on:
+  workflow_run:
+    types:
+      - "completed"
+    workflows:
+      - "Integrate"
+
+jobs:
+  merge:
+    name: "Merge"
+
+    runs-on: "ubuntu-latest"
+
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success' &&
+      github.actor == 'dependabot[bot]' && (
+        startsWith(github.event.workflow_run.head_commit.message, 'composer(deps-dev)') ||
+        startsWith(github.event.workflow_run.head_commit.message, 'github-actions(deps)')
+      )
+
+    steps:
+      - name: "Assign @ergebnis-bot"
+        uses: "ergebnis/.github/actions/github/pull-request/add-assignee@1.5.1"
+        with:
+          assignee: "ergebnis-bot"
+          github-token: "${{ secrets.ERGEBNIS_BOT_TOKEN }}"
+```
+
+For details, see [`actions/github/pull-request/add-assignee/action.yaml`](actions/github/pull-request/add-assignee/action.yaml).
+
+#### Inputs
+
+- `assignee`, required: The username of a user to add as an assignee to a pull request.
+- `github-token`, required: The GitHub token of a user with permission to add assignees to a pull request
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+The GitHub user with the username specified in the `assignee` input is assigned to the pull request.
+
+### <a name="github-pull-request-add-label-based-on-branch-name"> `ergebnis/.github/actions/github/pull-request/add-label-based-on-branch-name`
+
+This action adds a label to a pull request based on the name of the branch.
+
+```yaml
+# https://docs.github.com/en/actions
+
+name: "Triage"
+
+on: # yamllint disable-line rule:truthy
+  pull_request_target:
+    types:
+      - "opened"
+
+jobs:
+  label:
+    name: "Label"
+
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Add labels based on branch name"
+        uses: "ergebnis/.github/actions/github/pull-request/add-label-based-on-branch-name@1.5.1"
+        with:
+          github-token: "${{ secrets.ERGEBNIS_BOT_TOKEN }}"
+```
+
+For details, see [`actions/github/pull-request/add-label-based-on-branch-name/action.yaml`](actions/github/pull-request/add-label-based-on-branch-name/action.yaml).
+
+#### Inputs
+
+- `github-token`, required: The GitHub token of a user with permission to add labels to to a pull request.
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+- When the branch name starts with `feature/`, the label `enhancement` is added to the pull request by the user who owns the GitHub token specified with the `github-token` input.
+- When the branch name starts with `fix/`, the label `bug` is added to the pull request by the user who owns the GitHub token specified with the `github-token` input.
+
+### <a name="github-pull-request-approve"> `ergebnis/.github/actions/github/pull-request/approve`
+
+This action approves a pull request.
+
+This is useful when you want to automatically merge a pull request, but prefer to let a bot user approve the pull request beforehand.
+
+```yaml
+name: "Merge"
+
+on:
+  workflow_run:
+    types:
+      - "completed"
+    workflows:
+      - "Integrate"
+
+jobs:
+  merge:
+    name: "Merge"
+
+    runs-on: "ubuntu-latest"
+
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success' &&
+      github.actor == 'dependabot[bot]' && (
+        startsWith(github.event.workflow_run.head_commit.message, 'composer(deps-dev)') ||
+        startsWith(github.event.workflow_run.head_commit.message, 'github-actions(deps)')
+      )
+
+    steps:
+      - name: "Approve pull request"
+        uses: "ergebnis/.github/actions/github/pull-request/approve@1.5.1"
+        with:
+          github-token: "${{ secrets.ERGEBNIS_BOT_TOKEN }}"
+```
+
+For details, see [`actions/github/pull-request/merge/action.yaml`](actions/github/pull-request/merge/action.yaml).
+
+#### Inputs
+
+- `github-token`, required: The GitHub token of a user with permission to approve a pull request
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+The pull request is approved by the user who owns the GitHub token specified with the `github-token` input.
+
+### <a name="github-pull-request-merge"> `ergebnis/.github/actions/github/pull-request/merge`
+
+This action merges a pull request.
+
+This is useful when you want to automatically merge a pull request, for example, opened by [`dependabot`](https://github.com/dependabot).
+
+```yaml
+name: "Merge"
+
+on:
+  workflow_run:
+    types:
+      - "completed"
+    workflows:
+      - "Integrate"
+
+jobs:
+  merge:
+    name: "Merge"
+
+    runs-on: "ubuntu-latest"
+
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success' &&
+      github.actor == 'dependabot[bot]' && (
+        startsWith(github.event.workflow_run.head_commit.message, 'composer(deps-dev)') ||
+        startsWith(github.event.workflow_run.head_commit.message, 'github-actions(deps)')
+      )
+
+    steps:
+      - name: "Merge pull request"
+        uses: "ergebnis/.github/actions/github/pull-request/merge@1.5.1"
+        with:
+          github-token: "${{ secrets.ERGEBNIS_BOT_TOKEN }}"
+```
+
+For details, see [`actions/github/pull-request/merge/action.yaml`](actions/github/pull-request/merge/action.yaml).
+
+#### Inputs
+
+- `github-token`, required: The GitHub token of a user with permission to merge a pull request
+- `merge-method`, option: The merge method to use, one `"merge"`, `"rebase"`, `"squash"`, defaults to `"merge"`
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+The pull request is merged by the user who owns the GitHub token specified with the `github-token` input.
+
+### <a name="github-pull-request-request-review"> `ergebnis/.github/actions/github/pull-request/request-review`
+
+This action requests a review for a pull request.
+
+This is useful when you want to automatically merge a pull request, but prefer to let a bot user self-request a review for the pull request beforehand.
+
+```yaml
+name: "Merge"
+
+on:
+  workflow_run:
+    types:
+      - "completed"
+    workflows:
+      - "Integrate"
+
+jobs:
+  merge:
+    name: "Merge"
+
+    runs-on: "ubuntu-latest"
+
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success' &&
+      github.actor == 'dependabot[bot]' && (
+        startsWith(github.event.workflow_run.head_commit.message, 'composer(deps-dev)') ||
+        startsWith(github.event.workflow_run.head_commit.message, 'github-actions(deps)')
+      )
+
+    steps:
+      - name: "Request review from @ergebnis-bot"
+        uses: "ergebnis/.github/actions/github/pull-request/request-review@1.5.1"
+        with:
+          github-token: "${{ secrets.ERGEBNIS_BOT_TOKEN }}"
+          reviewer: "ergebnis-bot"
+```
+
+For details, see [`actions/github/pull-request/request-review/action.yaml`](actions/github/pull-request/request-review/action.yaml).
+
+#### Inputs
+
+- `github-token`, required: The GitHub token of a user with permission to request reviewers for a pull request.
+- `reviewer`, required: The username of user to request review from for a pull request.
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+A pull request review is requested for the user identified by the value of the `reviewer` input by the user who owns the GitHub token specified with the `github-token` input.
+
+### <a name="github-release-create"> `ergebnis/.github/actions/github/release/create`
+
+```yaml
+
+name: "Release"
+
+on:
+  push:
+    tags:
+      - "**"
+
+jobs:
+  release:
+    name: "Release"
+
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Create release"
+        uses: "ergebnis/.github/actions/github/release/create@1.5.1"
+        with:
+          github-token: "${{ secrets.ERGEBNIS_BOT_TOKEN }}"
+```
+
+For details, see [`actions/github/release/create/action.yaml`](actions/github/release/create/action.yaml).
+
+#### Inputs
+
+- `github-token`, required: The GitHub token of a user with permission to create a release.
+
+#### Outputs
+
+none
+
+#### Side Effects
+
+A release is created by the user who owns the GitHub token specified with the `github-token` input.
+
 ## Changelog
 
 Please have a look at [`CHANGELOG.md`](CHANGELOG.md).