diff --git a/Scripts/Services/Assistant/V1/Model/DialogNodeOutputGeneric.cs b/Scripts/Services/Assistant/V1/Model/DialogNodeOutputGeneric.cs
index 6beb6fd9..514443eb 100644
--- a/Scripts/Services/Assistant/V1/Model/DialogNodeOutputGeneric.cs
+++ b/Scripts/Services/Assistant/V1/Model/DialogNodeOutputGeneric.cs
@@ -1,5 +1,5 @@
 /**
-* (C) Copyright IBM Corp. 2019, 2021.
+* (C) Copyright IBM Corp. 2021.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -161,7 +161,7 @@ public class QueryTypeValue
         [JsonProperty("typing", NullValueHandling = NullValueHandling.Ignore)]
         public bool? Typing { get; protected set; }
         /// <summary>
-        /// The URL of the image.
+        /// The `https:` URL of the image.
         /// </summary>
         [JsonProperty("source", NullValueHandling = NullValueHandling.Ignore)]
         public string Source { get; protected set; }
@@ -176,6 +176,11 @@ public class QueryTypeValue
         [JsonProperty("description", NullValueHandling = NullValueHandling.Ignore)]
         public string Description { get; protected set; }
         /// <summary>
+        /// Descriptive text that can be used for screen readers or other situations where the image cannot be seen.
+        /// </summary>
+        [JsonProperty("alt_text", NullValueHandling = NullValueHandling.Ignore)]
+        public string AltText { get; protected set; }
+        /// <summary>
         /// An array of objects describing the options from which the user can choose. You can include up to 20 options.
         /// </summary>
         [JsonProperty("options", NullValueHandling = NullValueHandling.Ignore)]
diff --git a/Scripts/Services/Assistant/V1/Model/DialogNodeOutputGenericDialogNodeOutputResponseTypeImage.cs b/Scripts/Services/Assistant/V1/Model/DialogNodeOutputGenericDialogNodeOutputResponseTypeImage.cs
index 08acc41b..21175a24 100644
--- a/Scripts/Services/Assistant/V1/Model/DialogNodeOutputGenericDialogNodeOutputResponseTypeImage.cs
+++ b/Scripts/Services/Assistant/V1/Model/DialogNodeOutputGenericDialogNodeOutputResponseTypeImage.cs
@@ -1,5 +1,5 @@
 /**
-* (C) Copyright IBM Corp. 2020, 2021.
+* (C) Copyright IBM Corp. 2021.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -36,7 +36,7 @@ public new string ResponseType
             set { base.ResponseType = value; }
         }
         /// <summary>
-        /// The URL of the image.
+        /// The `https:` URL of the image.
         /// </summary>
         [JsonProperty("source", NullValueHandling = NullValueHandling.Ignore)]
         public new string Source
@@ -71,5 +71,14 @@ public new List<ResponseGenericChannel> Channels
             get { return base.Channels; }
             set { base.Channels = value; }
         }
+        /// <summary>
+        /// Descriptive text that can be used for screen readers or other situations where the image cannot be seen.
+        /// </summary>
+        [JsonProperty("alt_text", NullValueHandling = NullValueHandling.Ignore)]
+        public new string AltText
+        {
+            get { return base.AltText; }
+            set { base.AltText = value; }
+        }
     }
 }
diff --git a/Scripts/Services/Assistant/V1/Model/RuntimeResponseGeneric.cs b/Scripts/Services/Assistant/V1/Model/RuntimeResponseGeneric.cs
index 5ccfef6a..985d0cc7 100644
--- a/Scripts/Services/Assistant/V1/Model/RuntimeResponseGeneric.cs
+++ b/Scripts/Services/Assistant/V1/Model/RuntimeResponseGeneric.cs
@@ -1,5 +1,5 @@
 /**
-* (C) Copyright IBM Corp. 2019, 2021.
+* (C) Copyright IBM Corp. 2021.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -108,7 +108,7 @@ public class PreferenceValue
         [JsonProperty("typing", NullValueHandling = NullValueHandling.Ignore)]
         public bool? Typing { get; protected set; }
         /// <summary>
-        /// The URL of the image.
+        /// The `https:` URL of the image.
         /// </summary>
         [JsonProperty("source", NullValueHandling = NullValueHandling.Ignore)]
         public string Source { get; protected set; }
@@ -123,6 +123,11 @@ public class PreferenceValue
         [JsonProperty("description", NullValueHandling = NullValueHandling.Ignore)]
         public string Description { get; protected set; }
         /// <summary>
+        /// Descriptive text that can be used for screen readers or other situations where the image cannot be seen.
+        /// </summary>
+        [JsonProperty("alt_text", NullValueHandling = NullValueHandling.Ignore)]
+        public string AltText { get; protected set; }
+        /// <summary>
         /// An array of objects describing the options from which the user can choose.
         /// </summary>
         [JsonProperty("options", NullValueHandling = NullValueHandling.Ignore)]
diff --git a/Scripts/Services/Assistant/V1/Model/RuntimeResponseGenericRuntimeResponseTypeImage.cs b/Scripts/Services/Assistant/V1/Model/RuntimeResponseGenericRuntimeResponseTypeImage.cs
index 539882b8..1cb6cd9a 100644
--- a/Scripts/Services/Assistant/V1/Model/RuntimeResponseGenericRuntimeResponseTypeImage.cs
+++ b/Scripts/Services/Assistant/V1/Model/RuntimeResponseGenericRuntimeResponseTypeImage.cs
@@ -1,5 +1,5 @@
 /**
-* (C) Copyright IBM Corp. 2020, 2021.
+* (C) Copyright IBM Corp. 2021.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -36,7 +36,7 @@ public new string ResponseType
             set { base.ResponseType = value; }
         }
         /// <summary>
-        /// The URL of the image.
+        /// The `https:` URL of the image.
         /// </summary>
         [JsonProperty("source", NullValueHandling = NullValueHandling.Ignore)]
         public new string Source
@@ -72,5 +72,14 @@ public new List<ResponseGenericChannel> Channels
             get { return base.Channels; }
             set { base.Channels = value; }
         }
+        /// <summary>
+        /// Descriptive text that can be used for screen readers or other situations where the image cannot be seen.
+        /// </summary>
+        [JsonProperty("alt_text", NullValueHandling = NullValueHandling.Ignore)]
+        public new string AltText
+        {
+            get { return base.AltText; }
+            set { base.AltText = value; }
+        }
     }
 }