Update README.md

Author: dexbleeker

README.md

@@ -224,8 +224,8 @@ We recommend using [aws-actions/configure-aws-credentials](https://github.com/aw
 
 |               Name               | Description                                                                                                                                                                                                                               |
 | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `label`                                                                                                                                                                      | Name of the unique label assigned to the runner. <br><br> The label is used in two cases: <br> - to use as the input of `runs-on` property for the following jobs; <br> - to remove the runner from GitHub when it is not needed anymore. |
-| `ec2-instance-id`                                                                                                                                                            | EC2 Instance Id of the created runner. <br><br> The id is used to terminate the EC2 instance when the runner is not needed anymore.                                                                                                       |
+| `label`                                                                                                                                                                      | Name of the unique label assigned to the runners. <br><br> The label is used in two cases: <br> - to use as the input of `runs-on` property for the following jobs; <br> - to remove the runner from GitHub when it is not needed anymore. |
+| `ec2-instance-ids`                                                                                                                                                            | EC2 Instance Ids of the created runners. <br><br> The id is used to terminate the EC2 instance when the runner is not needed anymore.                                                                                                       |
 
 ### Example
 
@@ -240,7 +240,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       label: ${{ steps.start-ec2-runner.outputs.label }}
-      ec2-instance-id: ${{ steps.start-ec2-runner.outputs.ec2-instance-id }}
+      ec2-instance-ids: ${{ steps.start-ec2-runner.outputs.ec2-instance-ids }}
     steps:
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v1
@@ -291,7 +291,7 @@ jobs:
           mode: stop
           github-token: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
           label: ${{ needs.start-runner.outputs.label }}
-          ec2-instance-id: ${{ needs.start-runner.outputs.ec2-instance-id }}
+          ec2-instance-ids: ${{ needs.start-runner.outputs.ec2-instance-ids }}
 ```
 
 ### Real user examples