diff --git a/core/modules/layout_builder/src/SectionStorage/SectionStorageManagerInterface.php b/core/modules/layout_builder/src/SectionStorage/SectionStorageManagerInterface.php
index 7403008634..1c9dd409ec 100644
--- a/core/modules/layout_builder/src/SectionStorage/SectionStorageManagerInterface.php
+++ b/core/modules/layout_builder/src/SectionStorage/SectionStorageManagerInterface.php
@@ -31,14 +31,22 @@ public function load($type, array $contexts = []);
   /**
    * Finds the section storage to load based on available contexts.
    *
+   * After calling this method the $cacheability parameter will reflect the
+   * cacheability metadata used to determine the correct section storage. This
+   * must be applied to any output that results from the calling of this method.
+   *
    * @param \Drupal\Component\Plugin\Context\ContextInterface[] $contexts
    *   The contexts which should be used to determine which storage to return.
    * @param \Drupal\Core\Cache\CacheableMetadata $cacheability
    *   Cacheability metadata object, which will be populated based on the
-   *   cacheability of each section storage candidate.
+   *   cacheability of each section storage candidate. This is typically created
+   *   directly before this method call and must be applied to a render array
+   *   after this method call.
    *
    * @return \Drupal\layout_builder\SectionStorageInterface|null
    *   The section storage if one matched all contexts, or NULL otherwise.
+   *
+   * @see \Drupal\Core\Cache\CacheableMetadata
    */
   public function findByContext(array $contexts, CacheableMetadata $cacheability);
 
diff --git a/core/modules/layout_builder/src/SectionStorageInterface.php b/core/modules/layout_builder/src/SectionStorageInterface.php
index d044f34b3f..43345035b1 100644
--- a/core/modules/layout_builder/src/SectionStorageInterface.php
+++ b/core/modules/layout_builder/src/SectionStorageInterface.php
@@ -169,11 +169,18 @@ public function save();
    * Returns if the section storage should be selected during plugin mapping.
    *
    * @param \Drupal\Core\Cache\CacheableMetadata $cacheability
-   *   Cacheability metadata object, which must be populated with any
-   *   information used in this method.
+   *   Cacheability metadata object, typically provided by the section storage
+   *   manager. When implementing this method, populate $cacheability with any
+   *   information that affects whether the storage is applicable.
    *
    * @return bool
    *   TRUE if the section storage can be used, FALSE otherwise.
+   *
+   * @internal
+   *   This method is intended to be called by
+   *   \Drupal\layout_builder\SectionStorage\SectionStorageManagerInterface::findByContext().
+   *
+   * @see \Drupal\Core\Cache\CacheableMetadata
    */
   public function isApplicable(CacheableMetadata $cacheability);