diff --git a/ch04.asciidoc b/ch04.asciidoc
index b7958089..a41d838f 100644
--- a/ch04.asciidoc
+++ b/ch04.asciidoc
@@ -841,7 +841,7 @@ BIP0044 specifies the structure as consisting of five predefined tree levels:
 ====
 [source, bash]
 ----
-$ bx seed | bx hd-seed > m # create a new master private key from a seed and store in file "m"
+$ bx seed | bx hd-new > m # create a new master private key from a seed and store in file "m"
 $ cat m # show the master extended private key
 xprv9s21ZrQH143K38iQ9Y5p6qoB8C75TE71NfpyQPdfGvzghDt39DHPFpovvtWZaRgY5uPwV7RpEgHs7cvdgfiSjLjjbuGKGcjRyU7RGGSS8Xa
 $ cat m | bx hd-public # generate the M/0 extended public key