diff --git a/doc/ethapp.asc b/doc/ethapp.asc
index 7a336bc..9fef913 100644
--- a/doc/ethapp.asc
+++ b/doc/ethapp.asc
@@ -521,6 +521,7 @@ The following standard Status Words are returned for all APDUs - some specific S
 | *SW*     | *Description*
 |   6501   | TransactionType not supported
 |   6502   | Output buffer too small for snprintf input
+|   6503   | Plugin error
 |   6700   | Incorrect length
 |   6982   | Security status not satisfied (Canceled by user)
 |   6A80   | Invalid data