diff --git a/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php b/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php
index 5bd3e7b4d4..11d089291c 100644
--- a/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php
+++ b/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php
@@ -19,6 +19,9 @@
  * Provides an entity view display entity that has a layout.
  *
  * @internal
+ *   Layout Builder is currently experimental and should only be leveraged by
+ *   experimental modules and development releases of contributed modules.
+ *   See https://www.drupal.org/core/experimental for more information.
  */
 class LayoutBuilderEntityViewDisplay extends BaseEntityViewDisplay implements LayoutEntityDisplayInterface {
 
diff --git a/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplayStorage.php b/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplayStorage.php
index da3c874ad1..e86df9daf8 100644
--- a/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplayStorage.php
+++ b/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplayStorage.php
@@ -9,6 +9,11 @@
 
 /**
  * Provides storage for entity view display entities that have layouts.
+ *
+ * @internal
+ *   Layout Builder is currently experimental and should only be leveraged by
+ *   experimental modules and development releases of contributed modules.
+ *   See https://www.drupal.org/core/experimental for more information.
  */
 class LayoutBuilderEntityViewDisplayStorage extends ConfigEntityStorage {
 
diff --git a/core/modules/layout_builder/src/Entity/LayoutEntityDisplayInterface.php b/core/modules/layout_builder/src/Entity/LayoutEntityDisplayInterface.php
index 297055401e..1affc53b39 100644
--- a/core/modules/layout_builder/src/Entity/LayoutEntityDisplayInterface.php
+++ b/core/modules/layout_builder/src/Entity/LayoutEntityDisplayInterface.php
@@ -9,6 +9,9 @@
  * Provides an interface for entity displays that have layout.
  *
  * @internal
+ *   Layout Builder is currently experimental and should only be leveraged by
+ *   experimental modules and development releases of contributed modules.
+ *   See https://www.drupal.org/core/experimental for more information.
  */
 interface LayoutEntityDisplayInterface extends EntityDisplayInterface, SectionStorageInterface {
 
diff --git a/core/modules/layout_builder/src/Form/LayoutBuilderEntityViewDisplayForm.php b/core/modules/layout_builder/src/Form/LayoutBuilderEntityViewDisplayForm.php
index c68f2b77c5..9fa20648ff 100644
--- a/core/modules/layout_builder/src/Form/LayoutBuilderEntityViewDisplayForm.php
+++ b/core/modules/layout_builder/src/Form/LayoutBuilderEntityViewDisplayForm.php
@@ -11,6 +11,9 @@
  * Edit form for the LayoutBuilderEntityViewDisplay entity type.
  *
  * @internal
+ *   Layout Builder is currently experimental and should only be leveraged by
+ *   experimental modules and development releases of contributed modules.
+ *   See https://www.drupal.org/core/experimental for more information.
  */
 class LayoutBuilderEntityViewDisplayForm extends EntityViewDisplayEditForm {
 
diff --git a/core/modules/layout_builder/src/Routing/LayoutBuilderRoutesTrait.php b/core/modules/layout_builder/src/Routing/LayoutBuilderRoutesTrait.php
index a3ade65af9..920cbcf93e 100644
--- a/core/modules/layout_builder/src/Routing/LayoutBuilderRoutesTrait.php
+++ b/core/modules/layout_builder/src/Routing/LayoutBuilderRoutesTrait.php
@@ -8,6 +8,11 @@
 
 /**
  * Provides a trait for building routes for a Layout Builder UI.
+ *
+ * @internal
+ *   Layout Builder is currently experimental and should only be leveraged by
+ *   experimental modules and development releases of contributed modules.
+ *   See https://www.drupal.org/core/experimental for more information.
  */
 trait LayoutBuilderRoutesTrait {
 
diff --git a/core/modules/layout_builder/src/Routing/SectionStorageDefaultsParamConverter.php b/core/modules/layout_builder/src/Routing/SectionStorageDefaultsParamConverter.php
index 3937389172..c6435786bd 100644
--- a/core/modules/layout_builder/src/Routing/SectionStorageDefaultsParamConverter.php
+++ b/core/modules/layout_builder/src/Routing/SectionStorageDefaultsParamConverter.php
@@ -6,6 +6,11 @@
 
 /**
  * Provides a param converter for defaults-based section storage.
+ *
+ * @internal
+ *   Layout Builder is currently experimental and should only be leveraged by
+ *   experimental modules and development releases of contributed modules.
+ *   See https://www.drupal.org/core/experimental for more information.
  */
 class SectionStorageDefaultsParamConverter extends EntityConverter implements SectionStorageParamConverterInterface {
 
diff --git a/core/modules/layout_builder/src/SectionStorageInterface.php b/core/modules/layout_builder/src/SectionStorageInterface.php
index 9a82be9256..cc1efaba2a 100644
--- a/core/modules/layout_builder/src/SectionStorageInterface.php
+++ b/core/modules/layout_builder/src/SectionStorageInterface.php
@@ -61,7 +61,8 @@ public function insertSection($delta, Section $section);
   /**
    * Removes the section at the given delta.
    *
-   * This will re-key every subsequent section.
+   * As sections are stored sequentially and numerically this will re-key every
+   * subsequent section, shifting them forward.
    *
    * @param int $delta
    *   The delta of the section.