diff --git a/README.md b/README.md
index fcac1a8..2761d41 100644
--- a/README.md
+++ b/README.md
@@ -40,10 +40,10 @@ $ crypt4gh -h
 Utility for the cryptographic GA4GH standard, reading from stdin and outputting to stdout.
 
 Usage:
-   {PROG} [-hv] [--log <file>] encrypt [--sk <path>] --recipient_pk <path> [--recipient_pk <path>]... [--range <start-end>]
+   {PROG} [-hv] [--log <file>] encrypt [--sk <path>] --recipient_pk <path> [--recipient_pk <path>]... [--range <start-end>]  [--header <path>]
    {PROG} [-hv] [--log <file>] decrypt [--sk <path>] [--sender_pk <path>] [--range <start-end>]
    {PROG} [-hv] [--log <file>] rearrange [--sk <path>] --range <start-end>
-   {PROG} [-hv] [--log <file>] reencrypt [--sk <path>] --recipient_pk <path> [--recipient_pk <path>]... [--trim]
+   {PROG} [-hv] [--log <file>] reencrypt [--sk <path>] --recipient_pk <path> [--recipient_pk <path>]... [--trim] [--header-only]
 
 Options:
    -h, --help             Prints this help and exit
@@ -55,6 +55,8 @@ Options:
    --sender_pk <path>     Peer's Curve25519-based Public key to verify provenance (akin to signature)
    --range <start-end>    Byte-range either as  <start-end> or just <start> (Start included, End excluded)
    -t, --trim             Keep only header packets that you can decrypt
+   --header <path>        Where to write the header (default: stdout)
+   --header-only          Whether the input data consists only of a header (default: false)
 
 
 Environment variables: