Update Block Issuer Feature description

tips/TIP-0042/tip-0042.md

@@ -150,14 +150,15 @@ always need to be one _Account Unlock_ referencing a greater index.
 ## Block Issuer Feature
 
 The presence of a _Block Issuer Feature_ on an account signals that this account can issue blocks - it is a _block
-issuer account_. This feature defines the public keys with which signatures on blocks can be verified. A block issued
-from this account with a verified signature will burn Mana from the account's Block Issuance Credit (BIC) balance. If
-the balance becomes negative, the account is locked, meaning its output cannot be spent and it can no longer be used to
-issue blocks. Once locked, an account can only be unlocked by allotting enough Mana to the account's BIC balance for it
-to become non-negative again. Because the account itself cannot issue such a transaction, the block containing the
-alloting transaction must be issued by another account. The feature can only be removed with an expiration mechanism in
-order to disincentivize malicious behavior when issuing blocks. Any Mana generated or stored by an issuer account is
-locked to that account.
+issuer account_. This feature defines the public keys or key hashes which must match the public keys or their hashes
+provided in block signatures. A block issued from a block issuer account with a matching block issuer key and a verified
+signature will cause Mana to be burned from the account's Block Issuance Credit (BIC) balance. If the balance becomes
+negative, the account is locked, meaning its output cannot be spent and it can no longer be used to issue blocks. Once
+locked, an account can only be unlocked by allotting enough Mana to the account's BIC balance for it to become
+non-negative again. Because the account itself cannot issue such a transaction, the block containing the alloting
+transaction must be issued by another account. The feature can only be removed with an expiration mechanism in order to
+disincentivize malicious behavior when issuing blocks. Any Mana generated or stored by an issuer account is locked to
+that account.
 
 <details>
   <summary>Block Issuer Feature</summary>