diff --git a/docs/usage.md b/docs/usage.md
index d19374204..a6857a287 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -48,8 +48,8 @@ public class TwitterAuthenticator : AuthenticatorBase {
     }
 
     protected override async ValueTask<Parameter> GetAuthenticationParameter(string accessToken) {
-        var token = string.IsNullOrEmpty(Token) ? await GetToken() : Token;
-        return new HeaderParameter(KnownHeaders.Authorization, token);
+        Token = string.IsNullOrEmpty(Token) ? await GetToken() : Token;
+        return new HeaderParameter(KnownHeaders.Authorization, Token);
     }
 }
 ```