update comment

src/app/browser/main/tab/page.hpp

@@ -87,7 +87,7 @@ namespace app::browser::main::tab
             // Tools
             double progress_fraction; // Page preparation status, wanted for following needs:
                                       // * indication widgets (progress bar)
-                                      // * toggle window update action in main thread (e.g. on async data loading)
+                                      // * toggle window update action in main thread (e.g. on async data loading completed)
 
             // Actions
             Glib::RefPtr<Gio::SimpleAction> action__update;