diff --git a/options.c b/options.c
--- a/options.c
+++ b/options.c
-@@ -58,6 +58,7 @@ int preserve_uid = 0;
+@@ -59,6 +59,7 @@ int preserve_uid = 0;
int preserve_gid = 0;
int preserve_times = 0;
int update_only = 0;
int cvs_exclude = 0;
int dry_run = 0;
int do_xfers = 1;
-@@ -320,6 +321,9 @@ void usage(enum logcode F)
+@@ -321,6 +322,9 @@ void usage(enum logcode F)
rprintf(F," --backup-dir=DIR make backups into hierarchy based in DIR\n");
rprintf(F," --suffix=SUFFIX set backup suffix (default %s w/o --backup-dir)\n",BACKUP_SUFFIX);
rprintf(F," -u, --update skip files that are newer on the receiver\n");
rprintf(F," --inplace update destination files in-place (SEE MAN PAGE)\n");
rprintf(F," --append append data onto shorter files\n");
rprintf(F," --append-verify like --append, but with old data in file checksum\n");
-@@ -524,6 +528,9 @@ static struct poptOption long_options[] = {
+@@ -525,6 +529,9 @@ static struct poptOption long_options[] = {
{"size-only", 0, POPT_ARG_NONE, &size_only, 0, 0, 0 },
{"one-file-system", 'x', POPT_ARG_NONE, 0, 'x', 0, 0 },
{"update", 'u', POPT_ARG_NONE, &update_only, 0, 0, 0 },
{"existing", 0, POPT_ARG_NONE, &ignore_non_existing, 0, 0, 0 },
{"ignore-non-existing",0,POPT_ARG_NONE, &ignore_non_existing, 0, 0, 0 },
{"ignore-existing", 0, POPT_ARG_NONE, &ignore_existing, 0, 0, 0 },
-@@ -1662,6 +1669,11 @@ void server_options(char **args, int *argc_p)
+@@ -1670,6 +1677,11 @@ void server_options(char **args, int *argc_p)
if (!am_sender)
args[ac++] = "--sender";
-S, --sparse handle sparse files efficiently
+ --drop-cache tell OS to drop caching of file data
-n, --dry-run perform a trial run with no changes made
- -W, --whole-file copy files whole (without rsync algorithm)
+ -W, --whole-file copy files whole (w/o delta-xfer algorithm)
-x, --one-file-system don't cross filesystem boundaries
@@ -1023,6 +1024,10 @@ NOTE: Don't use this option when the destination is a Solaris "tmpfs"
filesystem. It doesn't seem to handle seeks over null regions