diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 30820a1..303dff4 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -2,7 +2,12 @@ name: Validate
 
 on:
   pull_request:
-    branches: [ main ]
+    branches:
+      - main
+  push:
+    branches:
+      - main
+      - v*
 
 jobs:
   validate-commit-messages:
@@ -14,7 +19,7 @@ jobs:
         uses: rainstormy/github-action-validate-commit-messages@v1
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
-          rules: 'acknowledged-author-email-addresses, acknowledged-author-names, acknowledged-committer-email-addresses, acknowledged-committer-names, capitalised-subject-lines, empty-line-after-subject-lines, imperative-subject-lines, limit-length-of-body-lines, limit-length-of-subject-lines, multi-word-subject-lines, no-co-authors, no-merge-commits, no-revert-revert-commits, no-squash-commits, no-trailing-punctuation-in-subject-lines, no-unexpected-whitespace'
+          rules: acknowledged-author-email-addresses, acknowledged-author-names, acknowledged-committer-email-addresses, acknowledged-committer-names, capitalised-subject-lines, empty-line-after-subject-lines, imperative-subject-lines, limit-length-of-body-lines, limit-length-of-subject-lines, multi-word-subject-lines, no-co-authors, no-merge-commits, no-revert-revert-commits, no-squash-commits, no-trailing-punctuation-in-subject-lines, no-unexpected-whitespace, unique-subject-lines
           acknowledged-author-email-addresses--patterns: '\d+\+.+@users\.noreply\.github\.com'
           acknowledged-author-names--patterns: '\p{Lu}.*\s.+'
           acknowledged-committer-email-addresses--patterns: '\d+\+.+@users\.noreply\.github\.com'
diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
new file mode 100644
index 0000000..853b590
--- /dev/null
+++ b/CHANGELOG.adoc
@@ -0,0 +1,20 @@
+= Changelog
+:experimental:
+:source-highlighter: highlight.js
+
+This file documents all notable changes to this project.
+The format is based on https://keepachangelog.com/en/1.1.0[Keep a Changelog], and this project adheres to https://semver.org/spec/v2.0.0.html[Semantic Versioning].
+
+== https://github.com/rainstormy/github-action-deploy-with-rsync-over-ssh/compare/v1.0.1\...HEAD[Unreleased]
+
+== https://github.com/rainstormy/github-action-deploy-with-rsync-over-ssh/compare/v1.0.0\...v1.0.1[1.0.1] - 2023-05-06
+=== Added
+* https://choosealicense.com/licenses/mit[MIT license].
+
+=== Fixed
+* Verify that all input parameters have been defined.
+
+== https://github.com/rainstormy/github-action-deploy-with-rsync-over-ssh/releases/tag/v1.0.0[1.0.0] - 2023-04-10
+
+=== Added
+* GitHub Actions entrypoint.
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..de99b72
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Rainstorm
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/action.yml b/action.yml
index a01333e..b99f402 100644
--- a/action.yml
+++ b/action.yml
@@ -27,18 +27,65 @@ inputs:
 runs:
   using: composite
   steps:
+    - name: Verify declaration of input parameters
+      env:
+        RSYNC_DESTINATION_PATH: ${{ inputs.rsync-destination-path }}
+        RSYNC_HOST: ${{ inputs.rsync-host }}
+        RSYNC_OPTIONS: ${{ inputs.rsync-options }}
+        RSYNC_SOURCE_PATH: ${{ inputs.rsync-source-path }}
+        SSH_KNOWN_HOSTS: ${{ inputs.ssh-known-hosts }}
+        SSH_PRIVATE_KEY: ${{ inputs.ssh-private-key }}
+        SSH_PRIVATE_KEY_FILENAME: ${{ inputs.ssh-private-key-filename }}
+      run: |
+        if [[ -z "$RSYNC_DESTINATION_PATH" ]]; then
+          echo "The input parameter 'rsync-destination-path' must be non-empty."
+          exit 1
+        fi
+        if [[ -z "$RSYNC_HOST" ]]; then
+          echo "The input parameter 'rsync-host' must be non-empty."
+          exit 1
+        fi
+        if [[ -z "$RSYNC_OPTIONS" ]]; then
+          echo "The input parameter 'rsync-options' must be non-empty."
+          exit 1
+        fi
+        if [[ -z "$RSYNC_SOURCE_PATH" ]]; then
+          echo "The input parameter 'rsync-source-path' must be non-empty."
+          exit 1
+        fi
+        if [[ -z "$SSH_KNOWN_HOSTS" ]]; then
+          echo "The input parameter 'ssh-known-hosts' must be non-empty."
+          exit 1
+        fi
+        if [[ -z "$SSH_PRIVATE_KEY" ]]; then
+          echo "The input parameter 'ssh-private-key' must be non-empty."
+          exit 1
+        fi
+        if [[ -z "$SSH_PRIVATE_KEY_FILENAME" ]]; then
+          echo "The input parameter 'ssh-private-key-filename' must be non-empty."
+          exit 1
+        fi
+      shell: bash
+
     - name: Prepare the SSH configuration
+      env:
+        SSH_KNOWN_HOSTS: ${{ inputs.ssh-known-hosts }}
+        SSH_PRIVATE_KEY: ${{ inputs.ssh-private-key }}
+        SSH_PRIVATE_KEY_FILENAME: ${{ inputs.ssh-private-key-filename }}
       run: |
         mkdir ~/.ssh
-        echo "${{ inputs.ssh-known-hosts }}" > ~/.ssh/known_hosts
+        echo "$SSH_KNOWN_HOSTS" > ~/.ssh/known_hosts
         chmod 644 ~/.ssh/known_hosts
-        echo "${{ inputs.ssh-private-key }}" > ~/.ssh/${{ inputs.ssh-private-key-filename }}
-        chmod 600 ~/.ssh/${{ inputs.ssh-private-key-filename }}
+        echo "$SSH_PRIVATE_KEY" > ~/.ssh/"$SSH_PRIVATE_KEY_FILENAME"
+        chmod 600 ~/.ssh/"$SSH_PRIVATE_KEY_FILENAME"
       shell: bash
 
     - name: Deploy with Rsync
+      env:
+        RSYNC_DESTINATION_PATH: ${{ inputs.rsync-destination-path }}
+        RSYNC_HOST: ${{ inputs.rsync-host }}
       run: |
-        rsync ${{ inputs.rsync-options }} ${{ inputs.rsync-source-path }} ${{ inputs.rsync-host }}:${{ inputs.rsync-destination-path }}
+        rsync ${{ inputs.rsync-options }} ${{ inputs.rsync-source-path }} "$RSYNC_HOST":"$RSYNC_DESTINATION_PATH"
       shell: bash
 
     - if: always()
diff --git a/package.json b/package.json
index 5d4856f..9372560 100644
--- a/package.json
+++ b/package.json
@@ -1,4 +1,5 @@
 {
+	"license": "MIT",
 	"packageManager": "yarn@3.5.0",
 	"private": true
 }