diff --git a/README.md b/README.md
index e19276b..dc9a6ec 100644
--- a/README.md
+++ b/README.md
@@ -102,7 +102,7 @@ Use the following environment variables to configure the application:
 | <tt>GITHUB_ACCESS_TOKEN</tt>| | GitHub access token. Instruction for creating a token can be found [here](./docs/gh-token.md). If not provided, the owners validating functionality may not work properly. For example, you may reach the API calls quota or, if you are setting GitHub Enterprise base URL, an unauthorized error may occur. |
 | <tt>GITHUB_BASE_URL</tt>| https://api.github.com/ | GitHub base URL for API requests. Defaults to the public GitHub API but can be set to a domain endpoint to use with GitHub Enterprise. |
 | <tt>GITHUB_UPLOAD_URL</tt> | https://uploads.github.com/ | GitHub upload URL for uploading files. <br> <br>It is taken into account only when `GITHUB_BASE_URL` is also set. If only `GITHUB_BASE_URL` is provided, this parameter defaults to the `GITHUB_BASE_URL` value. |
-| <tt>CHECKS</tt>| - |  List of checks to be executed. By default, all checks are executed. Possible values: `files`,`owners`,`duppatterns`. |
+| <tt>CHECKS</tt>| - |  List of checks to be executed. By default, all checks are executed. Possible values: `files`,`owners`,`duppatterns`,`syntax`. |
 | <tt>EXPERIMENTAL_CHECKS</tt> | - | The comma-separated list of experimental checks that should be executed. By default, all experimental checks are turned off. Possible values: `notowned`.|
 | <tt>CHECK_FAILURE_LEVEL</tt> | `warning` | Defines the level on which the application should treat check issues as failures. Defaults to `warning`, which treats both errors and warnings as failures, and exits with error code 3. Possible values are `error` and `warning`. |
 | <tt>OWNER_CHECKER_REPOSITORY</tt>  <b>*</b>| | The owner and repository name separated by slash. For example, gh-codeowners/codeowners-samples. Used to check if GitHub owner is in the given organization. |
diff --git a/action.yml b/action.yml
index ac2a94d..b9c51fc 100644
--- a/action.yml
+++ b/action.yml
@@ -21,7 +21,7 @@ inputs:
     required: false
 
   checks:
-    description: "The list of checks that will be executed. By default, all checks are executed. Possible values: files,owners,duppatterns"
+    description: "The list of checks that will be executed. By default, all checks are executed. Possible values: files,owners,duppatterns,syntax"
     required: false
     default: ""