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diff --git a/doc/cmd/nncp-ack.texi b/doc/cmd/nncp-ack.texi
index 5635cc1..358822d 100644
--- a/doc/cmd/nncp-ack.texi
+++ b/doc/cmd/nncp-ack.texi
@@ -1,5 +1,4 @@
 @node nncp-ack
-@cindex packet acknowledgement
 @pindex nncp-ack
 @section nncp-ack
 
@@ -7,57 +6,17 @@
 $ nncp-ack [options] -all
 $ nncp-ack [options] -node NODE[,@dots{}]
 $ nncp-ack [options] -node NODE -pkt PKT
-@end example
-
-Send acknowledgement of successful @option{PKT} (Base32-encoded hash)
-packet receipt from @option{NODE} node. If no @option{-pkt} is
-specified, then acknowledge all packet in node's @code{rx} outbound
-spool. If @option{-all} is specified, then do that for all nodes.
-
-General workflow with acknowledgement is following, assuming that
-Alice has some outbound packets for Bob:
-
-@itemize
-
-@item Transfer encrypted packets, without deleting them locally:
-
-@example
-alice$ nncp-xfer -keep -tx -node bob /mnt/shared
-@end example
-
-@item On Bob's side retrieve those packets:
-
-@example
-bob$ nncp-xfer -rx /mnt/shared
-@end example
 
-That will also check if copied packets checksum is not mismatched.
-
-@item Create ACK packets of received ones:
-
-@example
-bob$ nncp-ack -node alice
-@end example
-
-@item Send those newly created packets back to Alice:
-
-@example
-bob$ nncp-xfer -tx /mnt/shared
-@end example
-
-@item Get those acknowledgement packets and @ref{nncp-toss, toss} them:
-
-@example
-alice$ nncp-xfer -rx /mnt/shared
-alice$ nncp-toss
+$ nncp-ack [@dots{}] 4>&1 >&2 | nncp-rm [@dots{}] -pkt
 @end example
 
-Each ACK packet will remove kept corresponding outbound packets, because
-Bob explicitly confirmed their receipt.
-
-@end itemize
+Send @ref{ACK, acknowledgement} of successful @option{PKT}
+(Base32-encoded hash) packet receipt from @option{NODE} node. If no
+@option{-pkt} is specified, then acknowledge all packet in node's
+@code{rx} spool. If @option{-all} is specified, then do that for all
+nodes.
 
-Similarly you can use it with @command{@ref{nncp-bundle}}, but do not
-forget that by default it does not do checksumming of the packets, so
-you should either use its @option{-check} option, or run
-@command{@ref{nncp-check}} after.
+That commands outputs list of created encrypted ACK packets
+(@code{NODE/PKT}) to @strong{4}th file descriptor. That output can be
+passed for example to @command{@ref{nncp-rm}} to remove them after
+transmission to not wait for acknowledgement and retransmission.