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diff --git a/core/modules/help/help.api.php b/core/modules/help/help.api.php
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+<?php
+
+/**
+ * @file
+ * Hooks provided by the Help module.
+ */
+
+/**
+ * @addtogroup hooks
+ * @{
+ */
+
+/**
+ * Provide online user help.
+ *
+ * By implementing hook_help(), a module can make documentation available to
+ * the user for the module as a whole, or for specific paths.  Help for
+ * developers should usually be provided via function header comments in the
+ * code, or in special API example files.
+ *
+ * For a detailed usage example, see page_example.module.
+ *
+ * @param $path
+ *   The router menu path, as defined in hook_menu(), for the help that is
+ *   being requested; e.g., 'admin/people' or 'user/register'.  If the router
+ *   path includes a wildcard, then this will appear in $path as %, even if it
+ *   is a named %autoloader wildcard in the hook_menu() implementation; for
+ *   example, node pages would have $path equal to 'node/%' or 'node/%/view'.
+ *   To provide a help page for a whole module with a listing on admin/help,
+ *   your hook implementation should match a path with a special descriptor
+ *   after a "#" sign:
+ *     'admin/help#modulename'
+ *       The main module help text, displayed on the admin/help/modulename
+ *       page and linked to from the admin/help page.
+ * @param $arg
+ *   An array that corresponds to the return value of the arg() function, for
+ *   modules that want to provide help that is specific to certain values
+ *   of wildcards in $path. For example, you could provide help for the path
+ *   'user/1' by looking for the path 'user/%' and $arg[1] == '1'. This given
+ *   array should always be used rather than directly invoking arg(), because
+ *   your hook implementation may be called for other purposes besides building
+ *   the current page's help. Note that depending on which module is invoking
+ *   hook_help, $arg may contain only empty strings. Regardless, $arg[0] to
+ *   $arg[11] will always be set.
+ * @return
+ *   A localized string containing the help text.
+ */
+function hook_help($path, $arg) {
+  switch ($path) {
+    // Main module help for the block module
+    case 'admin/help#block':
+      return '<p>' . t('Blocks are boxes of content rendered into an area, or region, of a web page. The default theme Bartik, for example, implements the regions "Sidebar first", "Sidebar second", "Featured", "Content", "Header", "Footer", etc., and a block may appear in any one of these areas. The <a href="@blocks">blocks administration page</a> provides a drag-and-drop interface for assigning a block to a region, and for controlling the order of blocks within regions.', array('@blocks' => url('admin/structure/block'))) . '</p>';
+
+    // Help for another path in the block module
+    case 'admin/structure/block':
+      return '<p>' . t('This page provides a drag-and-drop interface for assigning a block to a region, and for controlling the order of blocks within regions. Since not all themes implement the same regions, or display regions in the same way, blocks are positioned on a per-theme basis. Remember that your changes will not be saved until you click the <em>Save blocks</em> button at the bottom of the page.') . '</p>';
+  }
+}
+
+/**
+ * @} End of "addtogroup hooks".
+ */