diff --git a/Error-Codes.md b/Error-Codes.md
index fa2be3b..6f50208 100644
--- a/Error-Codes.md
+++ b/Error-Codes.md
@@ -49,7 +49,8 @@ Code | Name
 **30x** | Transaction rejected.
 300 | Transaction rejected, unknown reason.
 301 | Fee too low.
-**31x** | Insufficient funds.
+302 | Invalid signature.
+**31x** | Insufficient funds. (determined by wallet prior to attempting to broadcast a tx)
 310 | Not enough LBC to cover the transaction, even after all UTXOs reach 6 confirmations.
 311 | Not enough LBC to cover the transaction, will be enough after some more confirmations.
 **32x** | Channel signing.