Polish

Issue: SPR-17572

src/docs/asciidoc/core/core-beans.adoc

@@ -6265,7 +6265,10 @@ metadata is provided per-instance rather than per-class.
 
 While classpath scanning is very fast, it is possible to improve the startup performance
 of large applications by creating a static list of candidates at compilation time. In this
-mode, all modules of the application must use this mechanism as, when the
+mode, all modules that are target of component scan must use this mechanism.
+
+NOTE: Your existing `@ComponentScan` or `<context:component-scan` directives must stay as
+is to request the context to scan candidates in certain packages. when the
 `ApplicationContext` detects such an index, it automatically uses it rather than scanning
 the classpath.