diff --git a/may15.html b/may15.html
index 21d6e670..836dd7bf 100644
--- a/may15.html
+++ b/may15.html
@@ -47,7 +47,7 @@ or building on blocks incompatible with the rest of the network.
 </p>
         <h2>Why this is necessary</h2>
 <p>
-A bug cause a <a href="chainfork.html">block chain fork on 11 March, 2013</a>.
+A bug caused a <a href="chainfork.html">temporary block chain fork on 11 March, 2013</a>.
 After investigating
 that bug, we determined that the bug can happen even if the entire network was
 still running old versions of Bitcoin-Qt/bitcoind. Therefore, the only option is to