X-Git-Url: http://git.alex.org.uk

diff --git a/doc/proto.txt b/doc/proto.txt
index d173365..61c2401 100644
--- a/doc/proto.txt
+++ b/doc/proto.txt
@@ -34,7 +34,8 @@ header consists a 32 bit magic number (magic), a 32 bit field denoting
 the request type (see below; 'type'), a 64 bit handle ('handle'), a 64
 bit data offset ('from'), and a 32 bit length ('len'). In case of a
 write request, the header is immediately followed by 'len' bytes of
-data.
+data. In the case of NBD_CMD_FLUSH, the offset and length are
+ignored.
 
 The reply contains three fields: a 32 bit magic number ('magic'), a 32
 bit error code ('error'; 0, unless an error occurred in which case it is