--- ./man/rash.1.orig	2010-12-13 04:50:53.000000000 +0100
+++ ./man/rash.1	2014-06-29 12:15:04.247544144 +0200
@@ -11,6 +11,10 @@
 |
 .B -q
 ] [
+.BR \-C\  "generate"
+|
+.BI \-C\  checksum
+] [
 .B \-D
 .I workingdir
 ] [
@@ -120,6 +124,24 @@
 .B \-c
 use sha1 checksums.
 .TP 19
+.BR \-C\  "generate"
+Print a sha1 checksum of the difference transcript of applied changes. For use with
+.IR auto ,
+.IR force
+or
+.IR update .
+.TP 19
+.BI \-C\  checksum
+In
+.I auto
+mode, exit with an error if the checksum of the difference transcript to be applied does not match
+.IR checksum .
+In
+.I update
+or
+.I force
+mode, warn if the two do not match.
+.TP 19
 .BI \-D\  workingdir
 change to
 .I workingdir