diff --git a/test/builder.js b/test/builder.js
index 45310d8..424109a 100644
--- a/test/builder.js
+++ b/test/builder.js
@@ -109,6 +109,7 @@ describe('base64 URL Encoding',function(){
   });
 
   it('does not create an uninitialized Buffer', function() { 
+  // see https://nodejs.org/api/buffer.html#buffer_buffer_from_buffer_alloc_and_buffer_allocunsafe
     var fromDigits = nJwt.base64urlEncode(10);
     var fromString = nJwt.base64urlEncode('10');
     assert.equal(fromDigits, fromString);