diff --git a/scripts/imgtool/main.py b/scripts/imgtool/main.py
index 920df78..ea95bad 100755
--- a/scripts/imgtool/main.py
+++ b/scripts/imgtool/main.py
@@ -321,6 +321,10 @@
 @click.option('--sig-out', metavar='filename',
               help='Path to the file to which signature will be written'
               'The image signature will be encoded as base64 formatted string')
+@click.option('--vector-to-sign', type=click.Choice(['payload', 'digest']),
+              help='send to OUTFILE the payload or payload''s digest instead of'
+              'complied image. These data can be used for external image'
+              'signing')
 @click.command(help='''Create a signed or unsigned image\n
                INFILE and OUTFILE are parsed as Intel HEX if the params have
                .hex extension, otherwise binary format is used''')
@@ -329,7 +333,7 @@
          endian, encrypt_keylen, encrypt, infile, outfile, dependencies,
          load_addr, hex_addr, erased_val, save_enctlv, security_counter,
          boot_record, custom_tlv, rom_fixed, max_align, clear, fix_sig,
-         fix_sig_pubkey, sig_out):
+         fix_sig_pubkey, sig_out, vector_to_sign):
 
     if confirm:
         # Confirmed but non-padded images don't make much sense, because
@@ -393,7 +397,8 @@
         }
 
     img.create(key, public_key_format, enckey, dependencies, boot_record,
-               custom_tlvs, int(encrypt_keylen), clear, baked_signature, pub_key)
+               custom_tlvs, int(encrypt_keylen), clear, baked_signature, pub_key,
+               vector_to_sign)
     img.save(outfile, hex_addr)
 
     if sig_out is not None: