diff --git a/guide/migration/20-to-30.md b/guide/migration/20-to-30.md
index f4b63f3..70761ad 100644
--- a/guide/migration/20-to-30.md
+++ b/guide/migration/20-to-30.md
@@ -103,6 +103,21 @@ consider moving to `System.Text.Json` when migrating to OpenIddict 3.0, as 3.0 n
 In most cases, this should be as simple as replacing `JsonConvert.SerializeObject()`/`JsonConvert.DeserializeObject()`
 by their `System.Text.Json` equivalent: `JsonSerializer.Serialize()`/`JsonSerializer.Deserialize()`.
 
+## Replace calls to the `AuthenticationTicket` extensions by their new `ClaimsPrincipal` equivalent:
+
+OpenIddict 3.0 no longer uses the `AuthenticationTicket` type provided by ASP.NET Core. Instead, everything is now stored in the `ClaimsPrincipal` instance.
+If you have calls like `ticket.SetScopes()` or `ticket.SetResources()`, use their new equivalents (e.g `principal.SetScopes()` or `principal.SetResources()`).
+
+## Use the new authentication schemes
+
+In 3.0, the constants used as the ASP.NET Core authentication schemes have changed:
+
+| Old constant name                                 | New constant name (ASP.NET Core host)                       |
+|---------------------------------------------------|-------------------------------------------------------------|
+| OpenIddictServerDefaults.AuthenticationScheme     | OpenIddictServerAspNetCoreDefaults.AuthenticationScheme     |
+| OpenIddictValidationDefaults.AuthenticationScheme | OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme |
+| OAuthValidationDefaults.AuthenticationScheme      | OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme |
+
 ## Update your application to work with the new `scope` format
 
 In OpenIddict 3.0, the format of the `scope` claim used in JWT tokens has changed from a JSON array to a single space-separated claim to match