Index: modules/book.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/book.module,v
retrieving revision 1.262
diff -u -r1.262 book.module
--- modules/book.module	15 Oct 2004 10:56:23 -0000	1.262
+++ modules/book.module	13 Nov 2003 08:57:50 -0000
@@ -811,6 +811,10 @@
   if (arg(0) == 'node' && is_numeric(arg(1)) && arg(2) == 'outline') {
     return t('The outline feature allows you to include posts in the <a href="%book">book hierarchy</a>.', array('%book' => url('book')));
   }
+  
+  if (arg(0) == 'node' && is_numeric(arg(1)) && arg(2) == 'revisions') {
+    return t('The revision feature allows you to track differences between multiple versions of a post.');
+  }
 }
 
 function book_help_page() {