From 4d8195f7832cdf4aebde5fad2ae50709cd4af3c0 Mon Sep 17 00:00:00 2001
From: Aaron Suggs <aaron@ktheory.com>
Date: Sat, 28 Jul 2012 22:29:21 -0400
Subject: [PATCH] README: describe instrumentation

---
 README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/README.md b/README.md
index 691a2a9..d5af25e 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,15 @@ Similarly for blacklisted responses:
 
 ## Logging & Instrumentation
 
+Rack::Attack uses the [ActiveSupport::Notifications](http://api.rubyonrails.org/classes/ActiveSupport/Notifications.html) API if available.
+
+You can subscribe to 'rack.attack' events and do whatever:
+
+    ActiveSupport::Notifications.subscribe("rack.attack") do |hash|
+      # Log it
+      # Graph it using statsd
+    end
+
 ## Motivation
 
 Abusive clients range from malicious login crackers to naively-written scrapers.