diff --git a/COPYING b/COPYING
index 40b4d909..4a835980 100644
--- a/COPYING
+++ b/COPYING
@@ -11,8 +11,9 @@ In this document,
   the Electric Coin Company and the Zcash Foundation according to section 6.2 (b)
   of the Zcash Trademark Agreement.
 - A "Zcash Chain Fork" means a blockchain that descends from the Zcash
-  blockchain and that is or was forked within 3456 blocks of the current block
-  height of the Zcash blockchain at the time of the fork;
+  blockchain and that activates a change to the consensus rules at a block 
+  height that is or was within 3456 blocks of the current height of the Zcash
+  chain at the time of activation.
 - A "Zcash Technology Testnet" means a blockchain designed for the purpose of
   testing technology potentially of use to the Zcash blockchain and not for
   the purpose of implementing any token of economic value, where this purpose