--- src/sbin/hammer/hammer.8	2008/02/06 09:00:28	1.6
+++ src/sbin/hammer/hammer.8	2008/02/23 20:55:21	1.7
@@ -82,6 +82,9 @@ at the root volume if not specified.
 The B-Tree is dumped recursively if the
 .Fl r
 option is specified.
+.It Ar blockmap
+Dump the btree, record, large-data, and small-data blockmaps, showing
+physical block assignments and free space percentages.
 .It Ar namekey Ar filename
 Generate a HAMMER 64 bit directory hash for the specified file name.
 The low 32 bits are used as an iterator for hash collisions and will be