diff --git a/types/result.go b/types/result.go
index 38787e8eb5..29b607a298 100644
--- a/types/result.go
+++ b/types/result.go
@@ -230,8 +230,8 @@ func (r TxResponse) GetTx() Tx {
 	return nil
 }
 
-// WrapServiceResult wraps a result from a protobuf RPC service method call in
-// a Result object or error. This method takes care of marshaling the res param to
+// WrapServiceResult wraps a result from a protobuf RPC service method call (res proto.Message, err error)
+// in a Result object or error. This method takes care of marshaling the res param to
 // protobuf and attaching any events on the ctx.EventManager() to the Result.
 func WrapServiceResult(ctx Context, res proto.Message, err error) (*Result, error) {
 	if err != nil {