diff --git a/core/modules/migrate/src/Plugin/migrate/source/EmptySource.php b/core/modules/migrate/src/Plugin/migrate/source/EmptySource.php
index 2391b0a..69fdc21 100644
--- a/core/modules/migrate/src/Plugin/migrate/source/EmptySource.php
+++ b/core/modules/migrate/src/Plugin/migrate/source/EmptySource.php
@@ -3,9 +3,22 @@
 namespace Drupal\migrate\Plugin\migrate\source;
 
 /**
- * Source returning an empty row.
+ * Source returning row based on the constants provided.
  *
- * This is generally useful when needing to create a field using a migration..
+ * This is generally useful when needing to create a field using a migration.
+ *
+ * Examples:
+ *
+ * @code
+ * source:
+ *   plugin: empty
+ *   constants:
+ *     entity_type: user
+ *     field_name: image
+ * @endcode
+ *
+ * This will enable creation of data, based on the "constants", without an
+ * existing source.
  *
  * @MigrateSource(
  *   id = "empty"