diff --git a/aspnetcore/performance/caching/middleware.md b/aspnetcore/performance/caching/middleware.md
index ed994ec8a0..ff49a8d536 100644
--- a/aspnetcore/performance/caching/middleware.md
+++ b/aspnetcore/performance/caching/middleware.md
@@ -74,6 +74,8 @@ if (responseCachingFeature != null)
 }
 ```
 
+Using a single value equal to `*` in `VaryByQueryKeys` varies the cache by all request query parameters.
+
 ## HTTP headers used by Response Caching Middleware
 
 Response caching by the middleware is configured using HTTP headers.