Update README.md

README.md

@@ -13,7 +13,7 @@ The following compression codings are supported:
   - gzip
   - br (brotli)
 
-**Note** Brotli provides better and faster compression then gzip or deflate, but is supported only since Node.js versions v11.7.0 and v10.16.0.
+**Note** Brotli provides [better and faster compression then gzip or deflate](https://expeditedsecurity.com/blog/nginx-brotli/), but is supported only since Node.js versions v11.7.0 and v10.16.0.
 
 ## Install
 
@@ -47,10 +47,12 @@ as compressing will transform the body.
 
 `compression()` accepts these properties in the options object. In addition to
 those listed below, [zlib](http://nodejs.org/api/zlib.html) options may be
-passed in to the options object.
+passed in to the options object or
+[brotli](https://nodejs.org/api/zlib.html#zlib_class_brotlioptions) options.
 
-As for *brotli*, a default is set to compression level 4, unless
-[anything else is specified](https://nodejs.org/api/zlib.html#zlib_class_brotlioptions).
+As for *brotli*, a default is set to compression level 4, unless anything else
+is specified. This is a balanced setting with [a very good speed and a very good
+compression ratio](https://expeditedsecurity.com/blog/nginx-brotli/).
 
 ##### chunkSize
 
@@ -147,6 +149,17 @@ The default value is `zlib.Z_DEFAULT_WINDOWBITS`, or `15`.
 See [Node.js documentation](http://nodejs.org/api/zlib.html#zlib_memory_usage_tuning)
 regarding the usage.
 
+##### params [*(brotli only)*](https://nodejs.org/api/zlib.html#zlib_brotli_constants)
+
+  - `zlib.constants.BROTLI_PARAM_MODE`
+    - `zlib.constants.BROTLI_MODE_GENERIC` (default)
+    - `zlib.constants.BROTLI_MODE_TEXT`, adjusted for UTF-8 text
+    - `zlib.constants.BROTLI_MODE_FONT`, adjusted for WOFF 2.0 fonts
+  - `zlib.constants.BROTLI_PARAM_QUALITY`
+    - Ranges from `zlib.constants.BROTLI_MIN_QUALITY` to
+      `zlib.constants.BROTLI_MAX_QUALITY`, with a default of
+      `4` (which is not node's default but the most optimal).
+
 #### .filter
 
 The default `filter` function. This is used to construct a custom filter