diff --git a/packages/zoe/src/contractSupport/zoeHelpers.js b/packages/zoe/src/contractSupport/zoeHelpers.js
index 01c38791321..4de0f07c512 100644
--- a/packages/zoe/src/contractSupport/zoeHelpers.js
+++ b/packages/zoe/src/contractSupport/zoeHelpers.js
@@ -176,11 +176,12 @@ export const depositToSeatSuccessMsg = `Deposit and reallocation successful.`;
  * The `amounts` and `payments` records must have corresponding
  * keywords.
  *
+ * @template {object} [OR=unknown]
  * @param {ZCF} zcf
  * @param {ZCFSeat} recipientSeat
  * @param {AmountKeywordRecord} amounts
  * @param {PaymentPKeywordRecord} payments
- * @returns {Promise<string>} `Deposit and reallocation successful.`
+ * @returns {Promise<OR>} `Deposit and reallocation successful.`
  */
 export const depositToSeat = async (zcf, recipientSeat, amounts, payments) => {
   !recipientSeat.hasExited() || Fail`The recipientSeat cannot have exited.`;
diff --git a/packages/zoe/src/typeGuards.js b/packages/zoe/src/typeGuards.js
index 410902f78d0..e694725fc7b 100644
--- a/packages/zoe/src/typeGuards.js
+++ b/packages/zoe/src/typeGuards.js
@@ -127,7 +127,7 @@ export const InvitationElementShape = M.splitRecord({
 });
 
 export const OfferHandlerI = M.interface('OfferHandler', {
-  handle: M.call(SeatShape).optional(M.any()).returns(M.string()),
+  handle: M.call(SeatShape).optional(M.any()).returns(M.any()),
 });
 
 export const SeatHandleAllocationsShape = M.arrayOf(