diff --git a/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationHandlers.cs b/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationHandlers.cs
index 8d6b5df5..765247d7 100644
--- a/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationHandlers.cs
+++ b/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationHandlers.cs
@@ -545,6 +545,8 @@ public static partial class OpenIddictClientWebIntegrationHandlers
                 context.Request["access_type"] = options.AccessType;
             }
 
+            // By default, Reddit doesn't return a refresh token but
+            // allows sending a "duration" parameter to retrieve one.
             else if (context.Registration.ProviderName is Providers.Reddit)
             {
                 var options = context.Registration.GetRedditOptions();
diff --git a/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xml b/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xml
index 0ebd62c7..b804c11a 100644
--- a/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xml
+++ b/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xml
@@ -136,6 +136,7 @@
                      TokenEndpoint="https://www.reddit.com/api/v1/access_token"
                      UserinfoEndpoint="https://oauth.reddit.com/api/v1/me">
         <GrantType Value="authorization_code" />
+        <GrantType Value="client_credentials" />
         <GrantType Value="refresh_token" />
 
         <TokenEndpointAuthMethod Value="client_secret_basic" />
diff --git a/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xsd b/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xsd
index 3e06f9fb..6a570aa7 100644
--- a/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xsd
+++ b/src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xsd
@@ -64,6 +64,7 @@
                                 <xs:simpleType>
                                   <xs:restriction base="xs:string">
                                     <xs:enumeration value="authorization_code" />
+                                    <xs:enumeration value="client_credentials" />
                                     <xs:enumeration value="implicit" />
                                     <xs:enumeration value="refresh_token" />
                                   </xs:restriction>