diff --git a/GoCardless/Resources/Payment.cs b/GoCardless/Resources/Payment.cs
index 15ac649..9b1ccca 100644
--- a/GoCardless/Resources/Payment.cs
+++ b/GoCardless/Resources/Payment.cs
@@ -38,9 +38,8 @@ public class Payment
         /// A future date on which the payment should be collected. If not
         /// specified, the payment will be collected as soon as possible. If the
         /// value is before the [mandate](#core-endpoints-mandates)'s
-        /// `next_possible_charge_date` we will roll it forwards to match. If
-        /// the value is not a working day it will be rolled forwards to the
-        /// next available one.
+        /// `next_possible_charge_date` creation will fail. If the value is not
+        /// a working day it will be rolled forwards to the next available one.
         /// </summary>
         [JsonProperty("charge_date")]
         public string ChargeDate { get; set; }
diff --git a/GoCardless/Services/PaymentService.cs b/GoCardless/Services/PaymentService.cs
index 80e0c4e..1bdffeb 100644
--- a/GoCardless/Services/PaymentService.cs
+++ b/GoCardless/Services/PaymentService.cs
@@ -244,9 +244,8 @@ public class PaymentCreateRequest : IHasIdempotencyKey
         /// A future date on which the payment should be collected. If not
         /// specified, the payment will be collected as soon as possible. If the
         /// value is before the [mandate](#core-endpoints-mandates)'s
-        /// `next_possible_charge_date` we will roll it forwards to match. If
-        /// the value is not a working day it will be rolled forwards to the
-        /// next available one.
+        /// `next_possible_charge_date` creation will fail. If the value is not
+        /// a working day it will be rolled forwards to the next available one.
         /// </summary>
         [JsonProperty("charge_date")]
         public string ChargeDate { get; set; }
@@ -681,9 +680,8 @@ public class PaymentRetryRequest
         /// A future date on which the payment should be collected. If not
         /// specified, the payment will be collected as soon as possible. If the
         /// value is before the [mandate](#core-endpoints-mandates)'s
-        /// `next_possible_charge_date` we will roll it forwards to match. If
-        /// the value is not a working day it will be rolled forwards to the
-        /// next available one.
+        /// `next_possible_charge_date` creation will fail. If the value is not
+        /// a working day it will be rolled forwards to the next available one.
         /// </summary>
         [JsonProperty("charge_date")]
         public string ChargeDate { get; set; }