diff --git a/README.md b/README.md
index 681796d9..b7c8809f 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,7 @@ and won't run anything unexpected.
 | **ENV VAR** | **Default Value** | **Notes** |
 | --- | --- | --- |
 | **VALIDATE_ALL_CODEBASE** | `true` | Will parse the entire repository and find all files to validate across all types. **NOTE:** When set to `false`, only **new** or **edited** files will be parsed for validation. |
+| **DEFAULT_BRANCH** | `master` | The name of the repository default branch. |
 | **VALIDATE_YAML** | `true` |Flag to enable or disable the linting process of the language. |
 | **VALIDATE_JSON** | `true` | Flag to enable or disable the linting process of the language. |
 | **VALIDATE_XML** | `true` | Flag to enable or disable the linting process of the language. |