diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index e9bc8de2..715f92cc 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -568,7 +568,7 @@ Chain.prototype._verify = function _verify(block, prev, callback) {
       }
 
       // Blocks that do not commit to
-      // witness data data cannot contain it.
+      // witness data cannot contain it.
       if (!commitmentHash) {
         if (block.hasWitness()) {
           return callback(new VerifyError(block,