Update docs

Author: devongovett

README.md

@@ -4,6 +4,13 @@ Emulates Node's [zlib](http://nodejs.org/api/zlib.html) module for [Browserify](
 using [pako](https://github.com/nodeca/pako). It uses the actual Node source code and passes the Node zlib tests
 by emulating the C++ binding that actually calls zlib.
 
+## Not implemented
+
+The following options/methods are not supported because pako does not support them yet.
+
+* The `params` method
+* The `dictionary` option
+
 ## License
 
 MIT

src/binding.js

@@ -18,6 +18,9 @@ exports.DEFLATERAW = 5;
 exports.INFLATERAW = 6;
 exports.UNZIP = 7;
 
+/**
+ * Emulate Node's zlib C++ layer for use by the JS layer in index.js
+ */
 function Zlib(mode) {
   if (mode < exports.DEFLATE || mode > exports.UNZIP)
     throw new TypeError("Bad argument");