diff -rup modules.orig/block/block.admin.inc modules/block/block.admin.inc
--- modules.orig/block/block.admin.inc	2010-10-10 22:11:21.000000000 +0200
+++ modules/block/block.admin.inc	2010-11-03 10:06:56.000000000 +0100
@@ -315,6 +315,7 @@ function block_admin_configure($form, &$
   $form['visibility_title'] = array(
     '#type' => 'item',
     '#title' => t('Visibility settings'),
+    '#description' => t('The block will be visible only if all the following conditions are met.'),
   );
   $form['visibility'] = array(
     '#type' => 'vertical_tabs',
diff -rup modules.orig/node/node.module modules/node/node.module
--- modules.orig/node/node.module	2010-10-31 13:45:27.000000000 +0100
+++ modules/node/node.module	2010-11-03 10:05:20.000000000 +0100
@@ -2272,7 +2272,7 @@ function node_form_block_admin_configure
     '#title' => t('Show block for specific content types'),
     '#default_value' => $default_type_options,
     '#options' => node_type_get_names(),
-    '#description' => t('Show this block only on pages that display content of the given type(s). If you select no types, there will be no type-specific limitation.'),
+    '#description' => t('Show this block only on node pages of the given content type(s). If you select no types, there will be no type-specific limitation.'),
   );
   $form['#submit'][] = 'node_form_block_admin_configure_submit';
 }