diff --git a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/RequestRateLimiterGatewayFilterFactory.java b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/RequestRateLimiterGatewayFilterFactory.java
index cb94c082..38ff8b82 100644
--- a/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/RequestRateLimiterGatewayFilterFactory.java
+++ b/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/RequestRateLimiterGatewayFilterFactory.java
@@ -30,6 +30,7 @@ import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.s
 
 /**
  * User Request Rate Limiter filter. See https://stripe.com/blog/rate-limiters and
+ * https://gist.github.com/ptarjan/e38f45f2dfe601419ca3af937fff574d#file-1-check_request_rate_limiter-rb-L11-L34.
  */
 @ConfigurationProperties("spring.cloud.gateway.filter.request-rate-limiter")
 public class RequestRateLimiterGatewayFilterFactory extends