diff --git a/core/modules/book/templates/book-tree.html.twig b/core/modules/book/templates/book-tree.html.twig
index d940a462bf6bce01903ae66abf4008c362670523..9f640d0b4cfb22600aa3d0b09677ce9f5666e8a5 100644
--- a/core/modules/book/templates/book-tree.html.twig
+++ b/core/modules/book/templates/book-tree.html.twig
@@ -1,6 +1,8 @@
 {#
 /**
  * @file
+ * Default theme implementation for a book tree.
+ *
  * Returns HTML for a wrapper for a book sub-tree.
  *
  * Available variables:
diff --git a/core/modules/filter/templates/filter-caption.html.twig b/core/modules/filter/templates/filter-caption.html.twig
index 0c73b9fd4dd17b01a26eadb6eb4e9905acb1464a..40f0538394eaef13392b8b14ea19af4f3755e7bf 100644
--- a/core/modules/filter/templates/filter-caption.html.twig
+++ b/core/modules/filter/templates/filter-caption.html.twig
@@ -1,5 +1,8 @@
 {#
 /**
+ * @file
+ * Default theme implementation for a filter caption.
+ *
  * Returns HTML for a captioned image, audio, video or other tag.
  *
  * Available variables
diff --git a/core/modules/node/templates/node-edit-form.html.twig b/core/modules/node/templates/node-edit-form.html.twig
index c208cf5896bf33106774e3198b6f0ddac18f285e..e34baf90bfd816114b177a5828ac52e9eb9d8c36 100644
--- a/core/modules/node/templates/node-edit-form.html.twig
+++ b/core/modules/node/templates/node-edit-form.html.twig
@@ -1,6 +1,8 @@
 {#
 /**
  * @file
+ * Default theme implementation for a node edit form.
+ *
  * Two column template for the node add/edit form.
  *
  * This template will be used when a node edit form specifies 'node_edit_form'