Mention ActiveRecord's config.example.yml

This will help people figure out what credentials and tables are required to 
run ActiveRecord specs.

1 files changed, 6 insertions, 4 deletions

diff --git a/guides/source/contributing_to_ruby_on_rails.md b/guides/source/contributing_to_ruby_on_rails.md
index 830a546570..ab07e0c6f3 100644
--- a/guides/source/contributing_to_ruby_on_rails.md
+++ b/guides/source/contributing_to_ruby_on_rails.md
@@ -335,10 +335,12 @@ file.
 
 #### Testing Active Record
 
-First, create the databases you'll need. For MySQL and PostgreSQL,
-running the SQL statements `create database activerecord_unittest` and
-`create database activerecord_unittest2` is sufficient. This is not
-necessary for SQLite3.
+First, create the databases you'll need. You can find a list of the required 
+table names, usernames, and passwords in `activerecord/test/config.example.yml`.
+
+For MySQL and PostgreSQL, running the SQL statements `create database
+activerecord_unittest` and `create database activerecord_unittest2` is
+sufficient. This is not necessary for SQLite3.
 
 This is how you run the Active Record test suite only for SQLite3: