diff --git a/docs/testing/phpunit.md b/docs/testing/phpunit.md
index 3e159bc0d48511525b114aea1c23f9059e16a1b4..bc0e23c19efdf706cd3f2228579e4b37389fbaf8 100644
--- a/docs/testing/phpunit.md
+++ b/docs/testing/phpunit.md
@@ -94,10 +94,9 @@ with that there are two methods:
 Sometimes it will be convenient to prepare test data for whole test case -
 in such case, you will want to put all the test data creation code in there.
 
-Another option is for your test to implement `TransactionalInterface`.
-
-That will guarantee that each test will be wrapped in a Transaction, that will
-rollback automatically at the end of the test.
+Another option is for your test to implement `TransactionalInterface`.  That
+will guarantee that each test will be wrapped in a SQL transaction which
+automatically rolls back any database changes.
 
 !!! warning
     Schema changes in your test will cause an auto-commit of all changes, and