Index: nano.man
==================================================================
--- nano.man
+++ nano.man
@@ -464,11 +464,15 @@
 as binary in big-endian notation.  The second argument is the block hash to
 stop sending at, or 256 bits of 0s to indicate that the entire chain should be
 sent.  The payload for Bulk_Pull messages is 64 bytes in size.
 
 The response from a Bulk_Pull request will be a stream of tuples, each
-containing a 256-bit block hash, and a block message.  TODOC: Format
+containing a 8-bit block type identifier, and a block message.  When no more
+blocks are available the response is terminated by sending the block type
+identifier for
+.I not_a_block
+and no block message follows.
 
 .TP
 .B Bulk_Push
 TODOC