diff --git a/module/VuFind/src/VuFind/Recommend/AbstractSearchManagerAwareModule.php b/module/VuFind/src/VuFind/Recommend/AbstractSearchManagerAwareModule.php
index f3fafcc478907be2693c3d132074c4fcdd53d533..d9b732acf5d5ed3cf4d2e8173d52048b3beae52d 100644
--- a/module/VuFind/src/VuFind/Recommend/AbstractSearchManagerAwareModule.php
+++ b/module/VuFind/src/VuFind/Recommend/AbstractSearchManagerAwareModule.php
@@ -43,6 +43,11 @@ use Zend\ServiceManager\ServiceLocatorInterface,
 abstract class AbstractSearchManagerAwareModule implements RecommendInterface,
     ServiceLocatorAwareInterface
 {
+    /**
+     * Service locator
+     *
+     * @var ServiceLocatorInterface
+     */
     protected $serviceLocator;
 
     /**
diff --git a/module/VuFind/src/VuFind/Record/Loader.php b/module/VuFind/src/VuFind/Record/Loader.php
index 8ae367b514ee6bd16e214ae2833d691e434c03c1..8c68f0e3a4d9f4b65a8eb6df292c4761b22b16cf 100644
--- a/module/VuFind/src/VuFind/Record/Loader.php
+++ b/module/VuFind/src/VuFind/Record/Loader.php
@@ -40,6 +40,13 @@ use Zend\ServiceManager\ServiceLocatorAwareInterface,
  */
 class Loader implements ServiceLocatorAwareInterface
 {
+    /**
+     * Service locator
+     *
+     * @var ServiceLocatorInterface
+     */
+    protected $serviceLocator;
+
     /**
      * Temporary method to get instance of object -- TODO: eliminate in place of
      * service manager after further refactoring.
diff --git a/module/VuFind/src/VuFind/Related/AbstractServiceLocator.php b/module/VuFind/src/VuFind/Related/AbstractServiceLocator.php
index 84894716e4e5bd905da1d4f9483db2006a5d2091..7a24e76015842f93c550eda9adc6825a03e80881 100644
--- a/module/VuFind/src/VuFind/Related/AbstractServiceLocator.php
+++ b/module/VuFind/src/VuFind/Related/AbstractServiceLocator.php
@@ -41,6 +41,11 @@ use Zend\ServiceManager\ServiceLocatorInterface,
 abstract class AbstractServiceLocator implements RelatedInterface,
     ServiceLocatorAwareInterface
 {
+    /**
+     * Service locator
+     *
+     * @var ServiceLocatorInterface
+     */
     protected $serviceLocator;
 
     /**