diff --git a/cmd/restic/global.go b/cmd/restic/global.go
index 05a9fabc9..a1fa2befc 100644
--- a/cmd/restic/global.go
+++ b/cmd/restic/global.go
@@ -126,7 +126,7 @@ func init() {
 	f.StringVar(&globalOptions.TLSClientCertKeyFilename, "tls-client-cert", "", "path to a `file` containing PEM encoded TLS client certificate and private key")
 	f.BoolVar(&globalOptions.InsecureTLS, "insecure-tls", false, "skip TLS certificate verification when connecting to the repository (insecure)")
 	f.BoolVar(&globalOptions.CleanupCache, "cleanup-cache", false, "auto remove old cache directories")
-	f.Var(&globalOptions.Compression, "compression", "compression mode (only available for repository format version 2), one of (auto|off|max)")
+	f.Var(&globalOptions.Compression, "compression", "compression mode (only available for repository format version 2), one of (auto|off|max) (default: $RESTIC_COMPRESSION)")
 	f.IntVar(&globalOptions.Limits.UploadKb, "limit-upload", 0, "limits uploads to a maximum `rate` in KiB/s. (default: unlimited)")
 	f.IntVar(&globalOptions.Limits.DownloadKb, "limit-download", 0, "limits downloads to a maximum `rate` in KiB/s. (default: unlimited)")
 	f.UintVar(&globalOptions.PackSize, "pack-size", 0, "set target pack `size` in MiB, created pack files may be larger (default: $RESTIC_PACK_SIZE)")
diff --git a/doc/manual_rest.rst b/doc/manual_rest.rst
index 7f812f4e0..f812e3a70 100644
--- a/doc/manual_rest.rst
+++ b/doc/manual_rest.rst
@@ -26,7 +26,7 @@ Usage help is available:
       dump          Print a backed-up file to stdout
       find          Find a file, a directory or restic IDs
       forget        Remove snapshots from the repository
-      generate      Generate manual pages and auto-completion files (bash, fish, zsh)
+      generate      Generate manual pages and auto-completion files (bash, fish, zsh, powershell)
       help          Help about any command
       init          Initialize a new repository
       key           Manage keys (passwords)
@@ -50,7 +50,7 @@ Usage help is available:
           --cacert file                file to load root certificates from (default: use system certificates)
           --cache-dir directory        set the cache directory. (default: use system default cache directory)
           --cleanup-cache              auto remove old cache directories
-          --compression mode           compression mode (only available for repository format version 2), one of (auto|off|max) (default auto)
+          --compression mode           compression mode (only available for repository format version 2), one of (auto|off|max) (default: $RESTIC_COMPRESSION) (default auto)
       -h, --help                       help for restic
           --insecure-tls               skip TLS certificate verification when connecting to the repository (insecure)
           --json                       set output mode to JSON for commands that support it
@@ -106,6 +106,7 @@ command:
           --files-from-raw file                    read the files to backup from file (can be combined with file args; can be specified multiple times)
           --files-from-verbatim file               read the files to backup from file (can be combined with file args; can be specified multiple times)
       -f, --force                                  force re-reading the target files/directories (overrides the "parent" flag)
+      -g, --group-by group                         group snapshots by host, paths and/or tags, separated by comma (disable grouping with '') (default host,paths)
       -h, --help                                   help for backup
       -H, --host hostname                          set the hostname for the snapshot manually. To prevent an expensive rescan use the "parent" flag
           --iexclude pattern                       same as --exclude pattern but ignores the casing of filenames
@@ -114,8 +115,8 @@ command:
           --ignore-inode                           ignore inode number changes when checking for modified files
           --no-scan                                do not run scanner to estimate size of backup
       -x, --one-file-system                        exclude other file systems, don't cross filesystem boundaries and subvolumes
-          --parent snapshot                        use this parent snapshot (default: last snapshot in the repository that has the same target files/directories, and is not newer than the snapshot time)
-          --read-concurrency n                     read n file concurrently (default: $RESTIC_READ_CONCURRENCY or 2)
+          --parent snapshot                        use this parent snapshot (default: latest snapshot in the group determined by --group-by and not newer than the timestamp determined by --time)
+          --read-concurrency n                     read n files concurrently (default: $RESTIC_READ_CONCURRENCY or 2)
           --stdin                                  read backup from stdin
           --stdin-filename filename                filename to use when reading from stdin (default "stdin")
           --tag tags                               add tags for the new snapshot in the format `tag[,tag,...]` (can be specified multiple times) (default [])
@@ -127,7 +128,7 @@ command:
           --cacert file                file to load root certificates from (default: use system certificates)
           --cache-dir directory        set the cache directory. (default: use system default cache directory)
           --cleanup-cache              auto remove old cache directories
-          --compression mode           compression mode (only available for repository format version 2), one of (auto|off|max) (default auto)
+          --compression mode           compression mode (only available for repository format version 2), one of (auto|off|max) (default: $RESTIC_COMPRESSION) (default auto)
           --insecure-tls               skip TLS certificate verification when connecting to the repository (insecure)
           --json                       set output mode to JSON for commands that support it
           --key-hint key               key ID of key to try decrypting first (default: $RESTIC_KEY_HINT)