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diff --git a/vzdump.1-synopsis.adoc b/vzdump.1-synopsis.adoc
index 7f14983..6036647 100644
--- a/vzdump.1-synopsis.adoc
+++ b/vzdump.1-synopsis.adoc
@@ -16,7 +16,7 @@ Backup all known guest systems on this host.
 
 Limit I/O bandwidth (KBytes per second).
 
-`--compress` `<0 | 1 | gzip | lzo>` ('default =' `0`)::
+`--compress` `<0 | 1 | gzip | lzo | zstd>` ('default =' `0`)::
 
 Compress dump file.
 
@@ -68,6 +68,10 @@ Use pigz instead of gzip when N>0. N=1 uses half of cores, N>1 uses N as thread
 
 Backup all known guest systems included in the specified pool.
 
+`--prune-backups` `[keep-all=<1|0>] [,keep-daily=<N>] [,keep-hourly=<N>] [,keep-last=<N>] [,keep-monthly=<N>] [,keep-weekly=<N>] [,keep-yearly=<N>]` ::
+
+Use these retention options instead of those from the storage configuration.
+
 `--quiet` `<boolean>` ('default =' `0`)::
 
 Be quiet.
@@ -108,3 +112,7 @@ Store resulting file to this storage.
 
 Store temporary files to specified directory.
 
+`--zstd` `<integer>` ('default =' `1`)::
+
+Zstd threads. N=0 uses half of the available cores, N>0 uses N as thread count.
+