diff --git a/bip-0030.mediawiki b/bip-0030.mediawiki
index a63b737d..b653ba64 100644
--- a/bip-0030.mediawiki
+++ b/bip-0030.mediawiki
@@ -12,7 +12,7 @@
 </pre>
 
 ==Abstract==
-This document gives a specification for dealing with duplicate transactions in the block chain, in an attempt to solve certain problems the reference implementations has with them.
+This document gives a specification for dealing with duplicate transactions in the block chain, in an attempt to solve certain problems the reference implementation has with them.
 
 ==Copyright==