diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index 76c4972d405c81..b102ed28fbc349 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -432,7 +432,7 @@ function clearBuffer(stream, state) {
 }
 
 Writable.prototype._write = function(chunk, encoding, cb) {
-  cb(new Error('not implemented'));
+  cb(new Error('_write method is not implemented.'));
 };
 
 Writable.prototype._writev = null;