diff --git a/packages/types/tailor.d.ts b/packages/types/tailor.d.ts
index df3ee5c..58a0e5e 100644
--- a/packages/types/tailor.d.ts
+++ b/packages/types/tailor.d.ts
@@ -333,4 +333,8 @@ declare namespace tailor.workflow {
      implementation.
      */
     function triggerJobFunction(job_name: string, args?: any): any;
+}
+
+declare class TailorErrorMessage extends Error {
+  constructor(message?: string);
 }
\ No newline at end of file