Tweak --checksum-seed docs.

options.c

@@ -802,6 +802,7 @@ void usage(enum logcode F)
 #ifdef ICONV_OPTION
   rprintf(F,"     --iconv=CONVERT_SPEC    request charset conversion of filenames\n");
 #endif
+  rprintf(F,"     --checksum-seed=NUM     set block/file checksum seed (advanced)\n");
   rprintf(F," -4, --ipv4                  prefer IPv4\n");
   rprintf(F," -6, --ipv6                  prefer IPv6\n");
   rprintf(F,"     --version               print version number\n");

rsync.yo

@@ -2551,15 +2551,15 @@ If rsync was complied without support for IPv6, the bf(--ipv6) option
 will have no effect.  The bf(--version) output will tell you if this
 is the case.
 
-dit(bf(--checksum-seed=NUM)) Set the checksum seed to the integer
-NUM.  This 4 byte checksum seed is included in each block and file
-checksum calculation.  By default the checksum seed is generated
-by the server and defaults to the current code(time()).  This option
-is used to set a specific checksum seed, which is useful for
-applications that want repeatable block and file checksums, or
-in the case where the user wants a more random checksum seed.
-Setting NUM to 0 causes rsync to use the default of code(time())
-for checksum seed.
+dit(bf(--checksum-seed=NUM)) Set the checksum seed to the integer NUM.  This 4
+byte checksum seed is included in each block and MD4 file checksum calculation
+(the more modern MD5 file checksums don't use a seed).  By default the checksum
+seed is generated by the server and defaults to the current code(time()).  This
+option is used to set a specific checksum seed, which is useful for
+applications that want repeatable block checksums, or in the case where the
+user wants a more random checksum seed.  Setting NUM to 0 causes rsync to use
+the default of code(time()) for checksum seed.
+
 enddit()
 
 manpagesection(DAEMON OPTIONS)