Index: wp-admin/includes/update.php
===================================================================
--- wp-admin/includes/update.php	(revision 19226)
+++ wp-admin/includes/update.php	(working copy)
@@ -187,7 +187,7 @@
 	$plugins_allowedtags = array('a' => array('href' => array(),'title' => array()),'abbr' => array('title' => array()),'acronym' => array('title' => array()),'code' => array(),'em' => array(),'strong' => array());
 	$plugin_name = wp_kses( $plugin_data['Name'], $plugins_allowedtags );
 
-	$details_url = self_admin_url('plugin-install.php?tab=plugin-information&plugin=' . $r->slug . '&TB_iframe=true&width=600&height=800');
+	$details_url = self_admin_url('plugin-install.php?tab=plugin-information&plugin=' . $r->slug . '&section=changelog&TB_iframe=true&width=600&height=800');
 
 	$wp_list_table = _get_list_table('WP_Plugins_List_Table');
 
Index: wp-admin/update-core.php
===================================================================
--- wp-admin/update-core.php	(revision 19226)
+++ wp-admin/update-core.php	(working copy)
@@ -255,7 +255,7 @@
 			$upgrade_notice = '';
 		}
 
-		$details_url = self_admin_url('plugin-install.php?tab=plugin-information&plugin=' . $plugin_data->update->slug . '&TB_iframe=true&width=640&height=662');
+		$details_url = self_admin_url('plugin-install.php?tab=plugin-information&plugin=' . $plugin_data->update->slug . '&section=changelog&TB_iframe=true&width=640&height=662');
 		$details_text = sprintf(__('View version %1$s details'), $plugin_data->update->new_version);
 		$details = sprintf('<a href="%1$s" class="thickbox" title="%2$s">%3$s</a>.', esc_url($details_url), esc_attr($plugin_data->Name), $details_text);