diff --git a/mmgen/main_txsign.py b/mmgen/main_txsign.py
index 4b4d22e1..e347ec45 100755
--- a/mmgen/main_txsign.py
+++ b/mmgen/main_txsign.py
@@ -34,6 +34,9 @@ opts_data = {
 		'options': """
 -h, --help            Print this help message
 --, --longhelp        Print help message for long (global) options
+-a, --autosign        Sign a transaction created for offline autosigning (see
+                      ‘mmgen-autosign’). The removable device is mounted and
+                      unmounted automatically
 -b, --brain-params=l,p Use seed length 'l' and hash preset 'p' for
                       brainwallet input
 -d, --outdir=      d  Specify an alternate directory 'd' for output
diff --git a/nix/user-packages.nix b/nix/user-packages.nix
index 3943bcf2..97488594 100644
--- a/nix/user-packages.nix
+++ b/nix/user-packages.nix
@@ -45,5 +45,6 @@ rec {
         # monero           = monero;          # XMR (test suite)
         # eth-keys         = eth-keys;        # ETH, ETC (test suite)
         # pure-protobuf    = pure-protobuf;   # THORChain
+        # bip-utils        = bip-utils;       # bip_hd
     };
 }