diff --git a/src/Plugin/Field/FieldWidget/InlineEntityFormBase.php b/src/Plugin/Field/FieldWidget/InlineEntityFormBase.php
index 701f74d..a24a63b 100644
--- a/src/Plugin/Field/FieldWidget/InlineEntityFormBase.php
+++ b/src/Plugin/Field/FieldWidget/InlineEntityFormBase.php
@@ -48,7 +48,7 @@ abstract class InlineEntityFormBase extends WidgetBase implements ContainerFacto
   protected $matchOperatorOptions;
 
   /**
-   * Constructs a InlineEntityFormBase object.
+   * Constructs an InlineEntityFormBase object.
    *
    * @param array $plugin_id
    *   The plugin_id for the widget.
@@ -60,7 +60,7 @@ abstract class InlineEntityFormBase extends WidgetBase implements ContainerFacto
    *   The widget settings.
    * @param array $third_party_settings
    *   Any third party settings.
-   * @param \Drupal\Core\Entity\EntityManager $entity_manager
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
    *   Entity manager service.
    */
   public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, array $third_party_settings, EntityManagerInterface $entity_manager) {
@@ -117,10 +117,11 @@ abstract class InlineEntityFormBase extends WidgetBase implements ContainerFacto
   /**
    * Sets inline entity form ID.
    *
-   * @param string $iefId
+   * @param string $ief_id
+   *   The inline entity form ID.
    */
-  protected function setIefId($iefId) {
-    $this->iefId = $iefId;
+  protected function setIefId($ief_id) {
+    $this->iefId = $ief_id;
   }
 
   /**
@@ -243,13 +244,12 @@ abstract class InlineEntityFormBase extends WidgetBase implements ContainerFacto
   }
 
   /**
-   * Returns an array of entity type labels (singular, plural) fit to be
-   * included in the UI text.
+   * Returns an array of entity type labels to be included in the UI text.
    *
    * @return array
-   *   Array containing two values:
-   *     - singular: label for singular form,
-   *     - plural: label for plural form.
+   *   Associative array with the following keys:
+   *   - 'singular': The label for singular form.
+   *   - 'plural': The label for plural form.
    */
   protected function labels() {
     // The admin has specified the exact labels that should be used.