diff --git a/cmd/docker-buildx/config.go b/cmd/docker-buildx/config.go
index 562293c..b6e7ff3 100644
--- a/cmd/docker-buildx/config.go
+++ b/cmd/docker-buildx/config.go
@@ -123,7 +123,7 @@ func settingsFlags(settings *plugin.Settings) []cli.Flag {
 		},
 		&cli.BoolFlag{
 			Name:        "tags.auto",
-			EnvVars:     []string{"PLUGIN_DEFAULT_TAGS", "PLUGIN_AUTO_TAG"},
+			EnvVars:     []string{"PLUGIN_AUTO_TAG"},
 			Usage:       "generates tag names automatically based on git branch and git tag",
 			Destination: &settings.Build.TagsAuto,
 		},
diff --git a/docs.md b/docs.md
index 7bc68f9..5644519 100644
--- a/docs.md
+++ b/docs.md
@@ -97,7 +97,7 @@ It will automatically generate buildkit configuration to use custom CA certifica
 | `daemon_off`              | `false`           | disables the startup of the docker daemon
 | `buildkit_config`         | *none*            | sets content of the docker [buildkit TOML config](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md)
 | `context`                 | `.`               | sets the path of the build context to use
-| `default_tags`/`auto_tag` | `false`           | generates tag names automatically based on git branch and git tag, tags supplied via `tags` are additionally added to the auto_tags without suffix
+| `auto_tag`                | `false`           | generates tag names automatically based on git branch and git tag, tags supplied via `tags` are additionally added to the auto_tags without suffix
 | `default_suffix"`/`auto_tag_suffix`| *none*   | generates tag names with the given suffix
 | `default_tag`             | `latest`          | overrides the default tag name used when generating with `auto_tag` enabled
 | `label`/`labels`          | *none*            | sets labels to use for the image in format `<name>=<value>`