diff --git a/packages/docs/src/spec/src/02-contracts/deposit-contract.rst b/packages/docs/src/spec/src/02-contracts/deposit-contract.rst
index 7e94b960..890542ac 100644
--- a/packages/docs/src/spec/src/02-contracts/deposit-contract.rst
+++ b/packages/docs/src/spec/src/02-contracts/deposit-contract.rst
@@ -137,7 +137,7 @@ Challenge
 
 Description
 ^^^^^^^^^^^
-Describes a challenge against a checkpoint.
+Describes a challenge against a checkpoint.  A challenge is a claom that the ``challengingCheckpoint`` has no valid transactions, meaning that the state update in the ``challengedCheckpoint`` could never have been reached and thus is invalid.
 
 Fields
 ^^^^^^