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-rw-r--r--guides/source/contributing_to_ruby_on_rails.md7
1 files changed, 6 insertions, 1 deletions
diff --git a/guides/source/contributing_to_ruby_on_rails.md b/guides/source/contributing_to_ruby_on_rails.md
index 17afd07820..ef3ebb1412 100644
--- a/guides/source/contributing_to_ruby_on_rails.md
+++ b/guides/source/contributing_to_ruby_on_rails.md
@@ -287,7 +287,12 @@ $ ruby -w -Itest test/mail_layout_test.rb -n test_explicit_class_layout
The `-n` option allows you to run a single method instead of the whole
file.
-##### Testing Active Record
+#### 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.
This is how you run the Active Record test suite only for SQLite3: