diff --git a/lib/bugsnag/integrations/railtie.rb b/lib/bugsnag/integrations/railtie.rb
index f9bf8f8c1..be1a6b64f 100644
--- a/lib/bugsnag/integrations/railtie.rb
+++ b/lib/bugsnag/integrations/railtie.rb
@@ -36,6 +36,8 @@ class Railtie < Rails::Railtie
 
     config.before_initialize do
       # Configure bugsnag rails defaults
+      # Skipping API key validation as the key may be set later in an
+      # initializer. If not, the key will be validated in after_initialize.
       Bugsnag.configure(false) do |config|
         config.logger = ::Rails.logger
         config.release_stage = ENV["BUGSNAG_RELEASE_STAGE"] || ::Rails.env.to_s