README.md in zip_tricks-4.2.3 vs README.md in zip_tricks-4.2.4

@@ -18,9 +18,45 @@
 
 Ruby 2.1+ syntax support (keyword arguments with defaults) and a working zlib (all available to jRuby as well).
 jRuby might experience problems when using the reader methods due to the argument of `IO#seek` being limited
 to [32 bit sizes.](https://github.com/jruby/jruby/issues/3817)
 
+
+## Diving in: send some large CSV reports from Rails
+
+The easiest is to use the Rails' built-in streaming feature:
+
+```ruby
+class ZipsController < ActionController::Base
+  include ActionController::Live
+
+  def download
+    response.headers['Content-Type'] = 'application/zip'
+    
+    # Create a wrapper for the write call that quacks like something you
+    # can << to, used by ZipTricks
+    w = ZipTricks::BlockWrite.new { |chunk| response.stream.write(chunk) }
+    
+    # Send out the archive of some Substantially Large CSV Files (tm)
+    ZipTricks::Streamer.open(w) do |zip|
+      zip.write_deflated_file('report1.csv') do |sink|
+        CSV(sink) do |csv_write|
+          csv << Person.column_names
+          Person.all.find_each do |person|
+            csv << person.attributes.values
+          end
+        end
+      end
+      zip.write_deflated_file('report2.csv') do |sink|
+        ...
+      end
+    end
+  ensure
+    response.stream.close
+  end
+end
+```
+
 ## Create a ZIP file without size estimation, compress on-the-fly during writes
 
 Basic use case is compressing on the fly. Some data will be buffered by the Zlib deflater, but
 memory inflation is going to be very constrained. Data will be written to destination at fairly regular
 intervals. Deflate compression will work best for things like text files.