diff --git a/src/SourcePluginUiBase.php b/src/SourcePluginUiBase.php
index 713040a..45f4ec0 100644
--- a/src/SourcePluginUiBase.php
+++ b/src/SourcePluginUiBase.php
@@ -42,6 +42,8 @@ class SourcePluginUiBase extends PluginBase implements SourcePluginUiInterface {
   }
 
   /**
+   * Builds the overview form for the source entities.
+   *
    * @param array $form
    *   Drupal form array.
    * @param \Drupal\Core\Form\FormStateInterface $form_state
@@ -74,6 +76,8 @@ class SourcePluginUiBase extends PluginBase implements SourcePluginUiInterface {
   }
 
   /**
+   * Submit handler for the source entities overview form.
+   *
    * @param array $form
    *   Drupal form array.
    * @param \Drupal\Core\Form\FormStateInterface $form_state