diff --git a/checknumberpaymentmethod.php b/checknumberpaymentmethod.php
index dfc1c72..917a7bf 100644
--- a/checknumberpaymentmethod.php
+++ b/checknumberpaymentmethod.php
@@ -185,6 +185,32 @@ function checknumberpaymentmethod_civicrm_preProcess($formName, &$form) {
  * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_preProcess
  */
 function checknumberpaymentmethod_civicrm_buildForm($formName, &$form) {
+  if ('CRM_Contribute_Form_AdditionalPayment' == $formName
+    && $form->getVar('_view') == 'transaction'
+    && ($form->getVar('_action') & CRM_Core_Action::BROWSE)
+  ) {
+
+    $paymentInstrumentsFromSettings = civicrm_api3('Setting', 'getvalue', [
+      'name' => 'check_payment_instrument_ids',
+    ]);
+    $payments = $form->get_template_vars('payments');
+    foreach ($payments as &$payment) {
+      try {
+        $checkNumber = civicrm_api3('FinancialTrxn', 'getvalue', [
+          'return' => "check_number",
+          'id' => $payment['id'],
+          'payment_instrument_id' => ['IN' => $paymentInstrumentsFromSettings],
+        ]);
+        if (!empty($checkNumber)) {
+          $payment['payment_instrument'] .= " (#{$checkNumber})";
+        }
+      }
+      catch (Exception $e) {
+        // Ignore
+      }
+    }
+    $form->assign('payments', $payments);
+  }
   if ('CRM_Admin_Form_Preferences_Contribute' == $formName) {
     $form->addElement(
       'select',
@@ -221,3 +247,28 @@ function checknumberpaymentmethod_civicrm_buildForm($formName, &$form) {
     $form->assign('paymentInstrumentsFromSettings', json_encode($paymentInstrumentsFromSettings));
   }
 }
+
+/**
+ * Implements hook_civicrm_pre().
+ *
+ * @link http://wiki.civicrm.org/confluence/display/CRMDOC/hook_civicrm_pre
+ */
+function checknumberpaymentmethod_civicrm_pre($op, $objectName, $id, &$params) {
+  if ($objectName == 'Contribution' && in_array($op, ['create', 'edit'])) {
+    if (!CRM_Utils_System::isNull($params['check_number']) || !empty($_POST['check_number'])) {
+      $paymentInstrumentId = !empty($params['payment_instrument_id']) ? $params['payment_instrument_id'] : $params['prevContribution']->payment_instrument_id;
+      $paymentInstrumentsFromSettings = civicrm_api3('Setting', 'getvalue', [
+        'name' => 'check_payment_instrument_ids',
+      ]);
+      if (!in_array($paymentInstrumentId, $paymentInstrumentsFromSettings)) {
+        return;
+      }
+      if (!CRM_Utils_System::isNull($params['check_number'])) {
+        $params['check_number'] = $params['check_number'];
+      }
+      else {
+        $params['check_number'] = $_POST['check_number'];
+      }
+    }
+  }
+}