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-rw-r--r--railties/lib/rails/rack/logger.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/railties/lib/rails/rack/logger.rb b/railties/lib/rails/rack/logger.rb
index 9962e6d943..7aaa353b91 100644
--- a/railties/lib/rails/rack/logger.rb
+++ b/railties/lib/rails/rack/logger.rb
@@ -7,6 +7,9 @@ require 'rack/body_proxy'
module Rails
module Rack
# Sets log tags, logs the request, calls the app, and flushes the logs.
+ #
+ # Log tags (+taggers+) can be an Array containing: methods that the <tt>request</tt> object responds to, a Proc
+ # that accepts an instance of the <tt>request</tt> object, or something that responds to <tt>to_s</tt>.
class Logger < ActiveSupport::LogSubscriber
def initialize(app, taggers = nil)
@app = app