Add a clarifying note to an extension example. (#12062)

diff --git a/documentation/gwt/gwt-extension.asciidoc b/documentation/gwt/gwt-extension.asciidoc
index 4e9fdec48a271cbe87a0bcd0f1f9c2ace6567ee4..53407ac47a375a02d07fe8add459b217f648f139 100644 (file)
--- a/documentation/gwt/gwt-extension.asciidoc
+++ b/documentation/gwt/gwt-extension.asciidoc
@@ -51,6 +51,8 @@ public class CapsLockWarning extends AbstractExtension {
     public static void addTo(PasswordField field) {
         new CapsLockWarning().extend(field);
     }
+    
+    // NOTE: you only need one of the above, not all of them
 }
 ----