diff --git a/docs/data/data.yaml b/docs/data/data.yaml
index f8eaf2d..37b1f5c 100644
--- a/docs/data/data.yaml
+++ b/docs/data/data.yaml
@@ -94,11 +94,11 @@ properties:
     defaultValue: false
     required: false
 
-  - name: config
+  - name: registry_config
     description: |
-      Content of the docker daemon json config.
+      Content of the registry credentials store file.
     type: string
-    defaultValue: $DOCKER_PLUGIN_CONFIG
+    defaultValue: $DOCKER_REGISTRY_CONFIG
     required: false
 
   - name: containerfile
diff --git a/plugin/plugin.go b/plugin/plugin.go
index 558a97b..dc933e5 100644
--- a/plugin/plugin.go
+++ b/plugin/plugin.go
@@ -337,7 +337,7 @@ func Flags(settings *Settings, category string) []cli.Flag {
 			EnvVars:     []string{"PLUGIN_REGISTRY_CONFIG", "DOCKER_REGISTRY_CONFIG"},
 			Usage:       "content of the registry credentials store file",
 			Destination: &settings.Registry.Config,
-			DefaultText: "$DOCKER_PLUGIN_CONFIG",
+			DefaultText: "$DOCKER_REGISTRY_CONFIG",
 			Category:    category,
 		},
 		&cli.BoolFlag{