diff --git a/README.md b/README.md
index 8fc1205..b711fdd 100644
--- a/README.md
+++ b/README.md
@@ -116,7 +116,7 @@ The following outputs can be used by subsequent workflow steps.
 
 - `pull-request-number` - The pull request number.
 - `pull-request-url` - The URL of the pull request.
-- `pull-request-operation` - The pull request operation performed by the action, `created`, `updated` or `closed`.
+- `pull-request-operation` - The pull request operation performed by the action, `created`, `updated`, `closed` or `none`.
 - `pull-request-head-sha` - The commit SHA of the pull request branch.
 - `pull-request-branch` - The branch name of the pull request.
 - `pull-request-commits-verified` - Whether GitHub considers the signature of the branch's commits to be verified; `true` or `false`.
diff --git a/dist/index.js b/dist/index.js
index 7daffaa..7065322 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -453,6 +453,7 @@ function createPullRequest(inputs) {
             // Action outputs
             const outputs = new Map();
             outputs.set('pull-request-branch', inputs.branch);
+            outputs.set('pull-request-operation', 'none');
             outputs.set('pull-request-commits-verified', 'false');
             // Create or update the pull request branch
             core.startGroup('Create or update the pull request branch');
diff --git a/src/create-pull-request.ts b/src/create-pull-request.ts
index f6bae8b..d45939f 100644
--- a/src/create-pull-request.ts
+++ b/src/create-pull-request.ts
@@ -178,6 +178,7 @@ export async function createPullRequest(inputs: Inputs): Promise<void> {
     // Action outputs
     const outputs = new Map<string, string>()
     outputs.set('pull-request-branch', inputs.branch)
+    outputs.set('pull-request-operation', 'none')
     outputs.set('pull-request-commits-verified', 'false')
 
     // Create or update the pull request branch