diff --git a/cmd/notation/blob/inspect.go b/cmd/notation/blob/inspect.go
index bce5cbc4..5e99b519 100644
--- a/cmd/notation/blob/inspect.go
+++ b/cmd/notation/blob/inspect.go
@@ -62,7 +62,7 @@ func runInspect(opts *inspectOpts) error {
 		return fmt.Errorf("unrecognized output format %s", opts.outputFormat)
 	}
 
-	envelopeMediaType, err := parseEnvelopeType(filepath.Base(opts.sigPath))
+	envelopeMediaType, err := parseEnvelopeMediaType(filepath.Base(opts.sigPath))
 	if err != nil {
 		return err
 	}
@@ -91,8 +91,8 @@ func runInspect(opts *inspectOpts) error {
 	return nil
 }
 
-// parseEnvelopeType returns the envelope media type based on the filename.
-func parseEnvelopeType(filename string) (string, error) {
+// parseEnvelopeMediaType returns the envelope media type based on the filename.
+func parseEnvelopeMediaType(filename string) (string, error) {
 	parts := strings.Split(filename, ".")
 	if len(parts) < 3 || parts[len(parts)-1] != "sig" {
 		return "", fmt.Errorf("invalid signature filename: %s", filename)