diff --git a/bip-0021.mediawiki b/bip-0021.mediawiki
index 8f2201be..9be8b9e7 100644
--- a/bip-0021.mediawiki
+++ b/bip-0021.mediawiki
@@ -26,13 +26,13 @@ They SHOULD require the user to manually approve each payment individually, thou
 === Operating system integration ===
 Graphical bitcoin clients SHOULD register themselves as the handler for the "bitcoin:" URI scheme by default, if no other handler is already registered. If there is already a registered handler, they MAY prompt the user to change it once when they first run the client.
 
-=== BNF grammar ===
+=== ABNF grammar ===
 
 (See also [[#Simpler syntax|a simpler representation of syntax]])
 
  bitcoinurn     = "bitcoin:" bitcoinaddress [ "?" bitcoinparams ]
  bitcoinaddress = base58 *base58
- bitcoinparams  = *bitcoinparam
+ bitcoinparams  = bitcoinparam [ "&" bitcoinparams ]
  bitcoinparam   = amountparam | labelparam | messageparam | otherparam | reqparam
  amountparam    = "amount=" *digit [ "." *digit ]
  labelparam     = "label=" *pchar