doc: add a variable declaration in the buffer.md

vsemozhetbyt · Fishrock123 · commit 30340388f100 · 2016-12-13T10:57:55.000-05:00
PR-URL: #9795 Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Anna Henningsen <anna@addaleax.net>
diff --git a/doc/api/buffer.md b/doc/api/buffer.md
@@ -2328,6 +2328,8 @@ The transcoding process will use substitution characters if a given byte
 sequence cannot be adequately represented in the target encoding. For instance:
 
 ```js
+const buffer = require('buffer');
+
 const newBuf = buffer.transcode(Buffer.from('€'), 'utf8', 'ascii');
 console.log(newBuf.toString('ascii'));
 // Prints: '?'
