diff --git a/core/modules/migrate/src/Plugin/migrate/process/MachineName.php b/core/modules/migrate/src/Plugin/migrate/process/MachineName.php
index 7aeb83f..5a4b4d5 100644
--- a/core/modules/migrate/src/Plugin/migrate/process/MachineName.php
+++ b/core/modules/migrate/src/Plugin/migrate/process/MachineName.php
@@ -29,8 +29,8 @@
  *     source: foo
  * @endcode
  *
- * If the value of foo in the source is áéí! then the destination value of bar
- * will be aei_.
+ * If the value of foo in the source is 'áéí!' then the destination value of bar
+ * will be 'aei_'.
  *
  * @see \Drupal\migrate\Plugin\MigrateProcessInterface
  *