diff --git a/README.md b/README.md
index 378d49a..73b444f 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,7 @@ jobs:
 
 - `task` (required): Must be `release`.
 - `token` (required): GitHub token.
+- `preRelease` (optional): Mark or not the release as pre-release. If not defined, detect the right value automatically from the version, [by following Marp project guideline.](https://github.com/marp-team/.github/blob/master/CONTRIBUTING.md#pre-release)
 
 <!--
 - `convertGitHubMention` (optional: `true` by default): Set whether to convert Markdown links to GitHub profile like `[@marp-team](https://github.com/marp-team/)` into a plain GitHub mention.
diff --git a/action.yml b/action.yml
index 27849f1..8a32a02 100644
--- a/action.yml
+++ b/action.yml
@@ -10,8 +10,8 @@ inputs:
     required: true
 
   # "release" task
-  convertGitHubMention:
-    description: Set whether to convert Markdown links to GitHub profile into a plain GitHub mention
+  preRelease:
+    description: Mark the release as pre-release
 
   # "upload" task
   files:
diff --git a/src/main.ts b/src/main.ts
index 4544d9d..9ca66ad 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -3,12 +3,23 @@ import release from './tasks/release'
 import upload from './tasks/upload'
 
 const get = (name: string, required = true) => core.getInput(name, { required })
+const getBoolean = (name: string, required = true) => {
+  const val = get(name, required).toLowerCase()
+
+  if (val === 'true') return true
+  if (val === 'false') return false
+
+  return undefined
+}
 
 async function run() {
   try {
     switch (get('task')) {
       case 'release':
-        await release({ token: get('token') })
+        await release({
+          token: get('token'),
+          preRelease: getBoolean('preRelease', false),
+        })
         break
       case 'upload':
         await upload({ token: get('token'), files: get('files').split(',') })
diff --git a/src/tasks/release.ts b/src/tasks/release.ts
index 7b58aac..d2a7f9f 100644
--- a/src/tasks/release.ts
+++ b/src/tasks/release.ts
@@ -9,6 +9,9 @@ export type ReleaseOptions = {
   /** Target version tag. We will use the name tagged in the current action if empty. */
   version?: string
 
+  /** Mark the release as pre-release. If not defined, detect the right value automatically from the version, by following Marp project guideline. */
+  preRelease?: boolean
+
   /** Convert Markdown link to GitHub profile into the mention link of GitHub. */
   convertGitHubMention?: boolean
 }
@@ -19,6 +22,7 @@ export type ReleaseOptions = {
 export default async function release({
   token,
   version: _version,
+  preRelease = undefined,
   convertGitHubMention = true,
 }: ReleaseOptions) {
   const octokit = getOctokit(token)
@@ -28,6 +32,8 @@ export default async function release({
       if (context.ref.startsWith('refs/tags/')) return context.ref.slice(10)
       throw new Error('Release task failed to detect the target version.')
     })()
+  const isPreRelease =
+    preRelease !== undefined ? preRelease : version.startsWith('v0.0.')
 
   // Parse CHANGELOG.md
   const changelog = path.resolve(process.cwd(), 'CHANGELOG.md')
@@ -64,7 +70,7 @@ export default async function release({
     body,
     name: version,
     owner: context.repo.owner,
-    prerelease: version.startsWith('v0.0.'),
+    prerelease: isPreRelease,
     repo: context.repo.repo,
     tag_name: version,
   })