* `'ucs2'` - Alias of `'utf16le'`.
-* `'base64'` - Base64 string encoding.
+* `'base64'` - Base64 string encoding. When creating a buffer from a string,
+ this encoding will also correctly accept "URL and Filename Safe Alphabet" as
+ specified in [RFC 4648, Section 5].
* `'binary'` - A way of encoding the buffer into a one-byte (`latin-1`)
encoded string. The string `'latin-1'` is not supported. Instead, pass
[`String.prototype.length`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length
[`util.inspect()`]: util.html#util_util_inspect_object_options
[iterator]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols
+[RFC 4648, Section 5]: https://tools.ietf.org/html/rfc4648#section-5