diff --git a/src/ap2/types/payment_receipt.py b/src/ap2/types/payment_receipt.py
index 18d7def8..c9e4ceea 100644
--- a/src/ap2/types/payment_receipt.py
+++ b/src/ap2/types/payment_receipt.py
@@ -80,7 +80,7 @@ class PaymentReceipt(BaseModel):
   )
   timestamp: str = Field(
       description=(
-          "The date and time the payment receipt was created, in ISO 8601"
+          "The date and time the payment receipt was created, in ISO 8601 "
           "format."
       ),
       default_factory=lambda: datetime.now(timezone.utc).isoformat(),
diff --git a/src/ap2/types/payment_request.py b/src/ap2/types/payment_request.py
index 22495028..72439045 100644
--- a/src/ap2/types/payment_request.py
+++ b/src/ap2/types/payment_request.py
@@ -217,8 +217,8 @@ class PaymentResponse(BaseModel):
   details: Optional[Dict[str, Any]] = Field(
       None,
       description=(
-          "A dictionary generated by a payment method that a merchant can use"
-          "to process a transaction. The contents will depend upon the payment"
+          "A dictionary generated by a payment method that a merchant can use "
+          "to process a transaction. The contents will depend upon the payment "
           "method."
       ),
   )