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-rw-r--r--activesupport/lib/active_support/log_subscriber.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/log_subscriber.rb b/activesupport/lib/active_support/log_subscriber.rb
index db991c7a32..8b9dd1fffe 100644
--- a/activesupport/lib/active_support/log_subscriber.rb
+++ b/activesupport/lib/active_support/log_subscriber.rb
@@ -29,6 +29,9 @@ module ActiveSupport
# subscriber, the line above should be called after your
# <tt>ActiveRecord::LogSubscriber</tt> definition.
#
+ # A logger also needs to be set with <tt>ActiveRecord::LogSubscriber.logger=</tt>.
+ # This is assigned automatically in a Rails environment.
+ #
# After configured, whenever a <tt>"sql.active_record"</tt> notification is published,
# it will properly dispatch the event
# (<tt>ActiveSupport::Notifications::Event</tt>) to the sql method.