diff --git a/README.md b/README.md
index e854a2fb1..dd542e59b 100644
--- a/README.md
+++ b/README.md
@@ -186,7 +186,7 @@ The following are optional as `step.with` keys
 | `preserve_order`           | Boolean | Indicator of whether order of files should be preserved when uploading assets                                                                                                                                                                                                                                                                                                                                                                   |
 | `files`                    | String  | Newline-delimited globs of paths to assets to upload for release                                                                                                                                                                                                                                                                                                                                                                                |
 | `name`                     | String  | Name of the release. defaults to tag name                                                                                                                                                                                                                                                                                                                                                                                                       |
-| `tag_name`                 | String  | Name of a tag. defaults to `github.ref`                                                                                                                                                                                                                                                                                                                                                                                                         |
+| `tag_name`                 | String  | Name of a tag. defaults to `github.ref_name`                                                                                                                                                                                                                                                                                                                                                                                                         |
 | `fail_on_unmatched_files`  | Boolean | Indicator of whether to fail if any of the `files` globs match nothing                                                                                                                                                                                                                                                                                                                                                                          |
 | `repository`               | String  | Name of a target repository in `<owner>/<repo>` format. Defaults to GITHUB_REPOSITORY env variable                                                                                                                                                                                                                                                                                                                                              |
 | `target_commitish`         | String  | Commitish value that determines where the Git tag is created from. Can be any branch or commit SHA. Defaults to repository default branch.                                                                                                                                                                                                                                                                                                      |