chore: Add comment in Styles (#12480)

diff --git a/server/src/main/java/com/vaadin/server/Page.java b/server/src/main/java/com/vaadin/server/Page.java
index bec3696620a2bc1c77045797fe92ecfb00c1cb7c..85720181def05bdd3e9a2f0e772c0a6f7d7e1e91 100644 (file)
--- a/server/src/main/java/com/vaadin/server/Page.java
+++ b/server/src/main/java/com/vaadin/server/Page.java
@@ -483,8 +483,10 @@ public class Page implements Serializable {
      */
     public static class Styles implements Serializable {
 
+        // For internal use only, visibility is package for enabling testing
         LinkedHashSet<InjectedStyle> injectedStyles = new LinkedHashSet<>();
 
+        // For internal use only, visibility is package for enabling testing
         LinkedHashSet<InjectedStyle> pendingInjections = new LinkedHashSet<>();
 
         private final UI ui;