diff --git a/plugins/auth-backend/src/service/router.ts b/plugins/auth-backend/src/service/router.ts
index ecd7f725a6..2f78f68d7d 100644
--- a/plugins/auth-backend/src/service/router.ts
+++ b/plugins/auth-backend/src/service/router.ts
@@ -44,6 +44,14 @@ export interface RouterOptions {
   config: Config;
   discovery: PluginEndpointDiscovery;
   tokenManager: TokenManager;
+  /**
+   * The algorithm to be used when signing the JWT token.
+   *
+   * @defaultValue `ES256`
+   *
+   * @remarks
+   * This is passed to {@link TokenFactory| the token factory}.
+   */
   tokenKeyAlgorithm?: string;
   providerFactories?: ProviderFactories;
 }