diff --git a/types/undertaker/index.d.ts b/types/undertaker/index.d.ts
index 23b5b7b65c..b19ad4ac79 100644
--- a/types/undertaker/index.d.ts
+++ b/types/undertaker/index.d.ts
@@ -11,6 +11,7 @@ declare namespace Undertaker {
     interface TaskFunctionParams {
         name?: string;
         displayName?: string;
+        description?: string;
     }
 
     interface TaskFunction extends TaskFunctionParams {