diff --git a/lib/internal/blob.js b/lib/internal/blob.js
index 450ad593f44507..3362feb43cbc2a 100644
--- a/lib/internal/blob.js
+++ b/lib/internal/blob.js
@@ -142,8 +142,8 @@ class Blob {
     markTransferMode(this, true, false);
 
     if (sources === null ||
-        typeof sources[SymbolIterator] !== 'function' ||
-        typeof sources === 'string') {
+       typeof sources[SymbolIterator] !== 'function' ||
+       typeof sources === 'string') {
       throw new ERR_INVALID_ARG_TYPE('sources', 'a sequence', sources);
     }
     validateDictionary(options, 'options');
@@ -312,6 +312,9 @@ class Blob {
     return dec.decode(await this.arrayBuffer());
   }
 
+  /**
+   * @returns {Promise<Uint8Array>}
+   */
   bytes() {
     if (!isBlob(this))
       throw new ERR_INVALID_THIS('Blob');