--- whois.admin.inc.orig	2010-01-29 10:25:11.000000000 +0000
+++ whois.admin.inc	2010-01-29 10:28:35.000000000 +0000
@@ -45,6 +45,23 @@
     '#default_value' => variable_get('whois_log_watchdog', 1),
     '#description' => t('Log a watchdog entry for each whois lookup performed.'),
   );
+  $form['whois_cache'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('Cache configuration'),
+    '#collapsed' => TRUE,
+  );
+  $form['whois_cache']['whois_cache_enable'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Enable cache'),
+    '#default_value' => variable_get('whois_cache_enable', 1),
+    '#description' => t('Enable the caching of whois records.'),
+  );
+  $form['whois_cache']['whois_cache_time'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Cache time'),
+    '#default_value' => variable_get('whois_cache_time', 86400),
+    '#description' => t('The length of time in seconds to cache whois lookup results.'),
+  );
   return system_settings_form($form);
 }