diff -u b/core/assets/scaffold/files/default.settings.php b/core/assets/scaffold/files/default.settings.php
--- b/core/assets/scaffold/files/default.settings.php
+++ b/core/assets/scaffold/files/default.settings.php
@@ -141,7 +141,7 @@
  * For MySQL, MariaDB or equivalent databases the 'isolation_level' option can
  * be set. The recommended transaction isolation level for Drupal sites is
  * 'READ COMMITTED'. The 'REPEATABLE READ' option is supported but can result
- * in deadlocks, the other 2 options are 'READ UNCOMMITTED' and 'SERIALIZABLE'.
+ * in deadlocks, the other two options are 'READ UNCOMMITTED' and 'SERIALIZABLE'.
  * They are available but not supported; use them at your own risk. For more
  * info:
  * https://dev.mysql.com/doc/refman/5.7/en/innodb-transaction-isolation-levels.html
diff -u b/core/modules/mysql/tests/src/Functional/RequirementsTest.php b/core/modules/mysql/tests/src/Functional/RequirementsTest.php
--- b/core/modules/mysql/tests/src/Functional/RequirementsTest.php
+++ b/core/modules/mysql/tests/src/Functional/RequirementsTest.php
@@ -70,7 +70,7 @@
   }
 
   /**
-   * Write the isolation level on settings.php.
+   * Writes the isolation level in settings.php.
    *
    * @param string $isolation_level
    *   The isolation level.
diff -u b/sites/default/default.settings.php b/sites/default/default.settings.php
--- b/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -141,7 +141,7 @@
  * For MySQL, MariaDB or equivalent databases the 'isolation_level' option can
  * be set. The recommended transaction isolation level for Drupal sites is
  * 'READ COMMITTED'. The 'REPEATABLE READ' option is supported but can result
- * in deadlocks, the other 2 options are 'READ UNCOMMITTED' and 'SERIALIZABLE'.
+ * in deadlocks, the other two options are 'READ UNCOMMITTED' and 'SERIALIZABLE'.
  * They are available but not supported; use them at your own risk. For more
  * info:
  * https://dev.mysql.com/doc/refman/5.7/en/innodb-transaction-isolation-levels.html