-mod_deflate can compress any output from lighttpd static or dynamic.
-It doesn't support caching compressed output like mod_compress.
+mod_deflate enables output compression of responses
+(Content-Encoding).
+
+Output compression reduces the network load and can improve the
+overall throughput of the webserver. All major http-clients support
+compression by announcing it in the Accept-Encoding header. This is
+used to negotiate the most suitable compression method.
+
+This module supports %{deflate_encodings} encodings.
+
+deflate (RFC1950, RFC1951) and gzip (RFC1952) depend on zlib while
+bzip2 depends on libbzip2. bzip2 is only supported by lynx and some
+other console text-browsers. brotli (RFC7932) is supported in most
+popular browsers.
+
+Since lighttpd 1.4.56, mod_deflate subsumes and replaces mod_compress.
+mod_deflate can compress static and dynamic responses, while
+mod_compress could compress only static files.