diff --git a/src/Form/SettingsForm.php b/src/Form/SettingsForm.php
index 64c253c..b5da724 100644
--- a/src/Form/SettingsForm.php
+++ b/src/Form/SettingsForm.php
@@ -88,6 +88,12 @@ class SettingsForm extends ConfigFormBase {
         ),
       ),
     );
+    $form['performance']['source_list_limit'] = [
+      '#type' => 'number',
+      '#title' => t('Source list limit'),
+      '#default_value' => \Drupal::configFactory()->getEditable('tmgmt.settings')->get('source_list_limit'),
+      '#min' => 20,
+    ];
     $form['text_formats'] = [
       '#type' => 'details',
       '#title' => t('Text format settings'),
@@ -127,6 +133,7 @@ class SettingsForm extends ConfigFormBase {
       ->set('allowed_formats', array_keys(array_filter($form_state->getValue('allowed_formats'))))
       ->set('submit_job_item_on_cron', $form_state->getValue('tmgmt_submit_job_item_on_cron'))
       ->set('job_items_cron_limit', $form_state->getValue('job_items_cron_limit'))
+      ->set('source_list_limit', $form_state->getValue('source_list_limit'))
       ->save();
 
     parent::submitForm($form, $form_state);