diff --git a/core/modules/views/src/Plugin/views/join/FieldOrLanguageJoin.php b/core/modules/views/src/Plugin/views/join/FieldOrLanguageJoin.php
index ee713a5..8373cd6 100644
--- a/core/modules/views/src/Plugin/views/join/FieldOrLanguageJoin.php
+++ b/core/modules/views/src/Plugin/views/join/FieldOrLanguageJoin.php
@@ -13,7 +13,8 @@
  * Implementation for the "field OR language" join.
  *
  * If the extra conditions contain either .langcode or .bundle,
- * they will be grouped and joined with OR.
+ * they will be grouped and joined with OR. All bundles the field
+ * appears on as untranslatable are included in $this->extra.
  *
  * @ingroup views_join_handlers
  *