3741 zfs needs better comments
Submitted by:   Will Andrews <willa@spectralogic.com>
Submitted by:   Justin Gibbs <justing@spectralogic.com>
Submitted by:   Alan Somers <alans@spectralogic.com>
Reviewed by:    Matthew Ahrens <mahrens@delphix.com>

@@ -24,10 +24,12 @@
  * Copyright (c) 2013 by Delphix. All rights reserved.
  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  */
 
 /*
+ * SPA: Storage Pool Allocator
+ *
  * This file contains all the routines used when modifying on-disk SPA state.
  * This includes opening, importing, destroying, exporting a pool, and syncing a
  * pool.
  */