diff --git a/dip-0003.md b/dip-0003.md
index 07d7741..b9b4c00 100644
--- a/dip-0003.md
+++ b/dip-0003.md
@@ -211,8 +211,8 @@ Reorganisations of the chain must also correctly undo changes to the chain-tips
 
 A ProRegTx is invalid if any of these conditions are true:
 
-  1. collateralOutpoint `hash` is empty but no output with 1000 DASH can be found on position `n` in outputs of ProRegTx
-  2. collateralOutpoint `hash` is not empty but no output with 1000 DASH can't be found in UTXO with these `hash` and `n`
+  1. collateralOutpoint `hash` is null but no output with 1000 DASH can be found on position `n` in outputs of ProRegTx
+  2. collateralOutpoint `hash` is not null but no output with 1000 DASH can't be found in UTXO with these `hash` and `n`
   3. Any KeyId* field is null (KeyIdOwner, KeyIdOperator or KeyIdVoting)
   4. KeyIdOwner or KeyIdOperator was already used by any entry in the registered masternodes set
   5. scriptPayout is not a P2PKH or P2SH script