diff --git a/bdchain/api/common.proto b/bdchain/api/common.proto
index 76dc142..b4187c5 100644
--- a/bdchain/api/common.proto
+++ b/bdchain/api/common.proto
@@ -11,6 +11,7 @@ message Error {
     string code = 1; // One of a server-defined set of error codes.
     string message = 2; // A human-readable representation of the error.
     string target = 3; // The target of the error.
+    repeated Error details = 4; // An array of details about specific errors that led to this reported error.
 }
 
 message ClientVersionResponse {