diff --git a/modules/rdf_export/src/Routing/RouteSubscriber.php b/modules/rdf_export/src/Routing/RouteSubscriber.php
index 04be71b..ce166d7 100644
--- a/modules/rdf_export/src/Routing/RouteSubscriber.php
+++ b/modules/rdf_export/src/Routing/RouteSubscriber.php
@@ -18,6 +18,8 @@ class RouteSubscriber extends RouteSubscriberBase {
 
   /**
    * The entity type manager service.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
    */
   protected EntityTypeManagerInterface $entityTypeManager;
 
diff --git a/modules/rdf_taxonomy/src/EventSubscriber/TermParentSubscriber.php b/modules/rdf_taxonomy/src/EventSubscriber/TermParentSubscriber.php
index 55e638a..92f89d6 100644
--- a/modules/rdf_taxonomy/src/EventSubscriber/TermParentSubscriber.php
+++ b/modules/rdf_taxonomy/src/EventSubscriber/TermParentSubscriber.php
@@ -25,6 +25,8 @@ class TermParentSubscriber implements EventSubscriberInterface {
 
   /**
    * The entity type manager service.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
    */
   protected EntityTypeManagerInterface $entityTypeManager;
 
diff --git a/modules/rdf_taxonomy/src/TermRdfStorage.php b/modules/rdf_taxonomy/src/TermRdfStorage.php
index 354954e..24a6b4f 100644
--- a/modules/rdf_taxonomy/src/TermRdfStorage.php
+++ b/modules/rdf_taxonomy/src/TermRdfStorage.php
@@ -34,6 +34,8 @@ class TermRdfStorage extends SparqlEntityStorage implements TermStorageInterface
 
   /**
    * The active database connection.
+   *
+   * @var \Drupal\Core\Database\Connection
    */
   protected Connection $database;
 
@@ -52,36 +54,50 @@ class TermRdfStorage extends SparqlEntityStorage implements TermStorageInterface
 
   /**
    * Array of loaded parents keyed by child term ID.
+   *
+   * @var array
    */
   protected array $parents = [];
 
   /**
    * Array of all loaded term ancestry keyed by ancestor term ID.
+   *
+   * @var array
    */
   protected array $parentsAll = [];
 
   /**
    * Array of child terms keyed by parent term ID.
+   *
+   * @var array
    */
   protected array $children = [];
 
   /**
    * Array of term parents keyed by vocabulary ID and child term ID.
+   *
+   * @var array
    */
   protected array $treeParents = [];
 
   /**
    * Array of term ancestors keyed by vocabulary ID and parent term ID.
+   *
+   * @var array
    */
   protected array $treeChildren = [];
 
   /**
    * Array of terms in a tree keyed by vocabulary ID and term ID.
+   *
+   * @var array
    */
   protected array $treeTerms = [];
 
   /**
    * Array of loaded trees keyed by a cache id matching tree arguments.
+   *
+   * @var array
    */
   protected array $trees = [];