Update static-files.md

Author: Rick-Anderson

aspnetcore/fundamentals/static-files.md

@@ -45,7 +45,7 @@ Creating performant web apps requires optimizing asset delivery to the browser.
 * Prevent the browser from using old or stale assets after an app is updated. Set the [Last-Modified](https://developer.mozilla.org/docs/Web/HTTP/Headers/Last-Modified) header.
 * Set up proper [caching headers](https://developer.mozilla.org/docs/Web/HTTP/Headers/Cache-Control).
 * Use [caching middleware](xref:performance/caching/middleware).
-* Serve [compressed](/aspnet/core/performance/response-compression) versions of the assets when possible.
+* Serve [compressed](/aspnet/core/performance/response-compression) versions of the assets when possible. `MapStaticAssets` integrates the information gathered about static web assets during the build or publish process with a runtime library that processes this information to optimize file serving to the browser
 * Use a [CDN](/microsoft-365/enterprise/content-delivery-networks?view=o365-worldwide&preserve-view=true) to serve the assets closer to the user.
 * Minimize the size of assets served to the browser. This optimization doesn't include minification.