Index: modules/block/block.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/block/block.module,v
retrieving revision 1.339
diff -u -p -r1.339 block.module
--- modules/block/block.module	28 May 2009 16:44:06 -0000	1.339
+++ modules/block/block.module	29 May 2009 18:19:17 -0000
@@ -416,7 +416,14 @@ function block_user_form(&$edit, &$accou
   if ($category == 'account') {
     $rids = array_keys($account->roles);
     $result = db_query("SELECT DISTINCT b.* FROM {block} b LEFT JOIN {block_role} r ON b.module = r.module AND b.delta = r.delta WHERE b.status = 1 AND b.custom <> 0 AND (r.rid IN (:rids) OR r.rid IS NULL) ORDER BY b.weight, b.module", array(':rids' => $rids));
-    $form['block'] = array('#type' => 'fieldset', '#title' => t('Block configuration'), '#weight' => 3, '#collapsible' => TRUE, '#tree' => TRUE);
+    $form['block'] = array(
+      '#type' => 'fieldset',
+      '#title' => t('Configure block display'),
+      '#description' => t('Blocks are boxes of content (e.g., a list of links) that complement the main content. Checking a box below will enable that block, allowing its content to appear.'),
+      '#weight' => 3,
+      '#collapsible' => TRUE,
+      '#tree' => TRUE
+    );
     foreach ($result as $block) {
       $data = module_invoke($block->module, 'block_list');
       if ($data[$block->delta]['info']) {