diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
index 3f2e86a98dad3f8fb438e8f2ade9b911e63555b6..53dbbd8c218d7279ca89ece04c97da52e3e0440c 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
@@ -825,7 +825,7 @@ def checkout_and_verify(c)
     #   end
     #
     #   class Book < ActiveRecord::Base
-    #     establish_connection "library_db"
+    #     establish_connection :library_db
     #   end
     #
     #   class ScaryBook < Book