diff --git a/config/chromeos/ui_mode.gni b/config/chromeos/ui_mode.gni
index 116616129..c698d121a 100644
--- a/config/chromeos/ui_mode.gni
+++ b/config/chromeos/ui_mode.gni
@@ -4,7 +4,8 @@
 
 declare_args() {
   # This controls UI configuration for Chrome.
-  # If this flag is set, we assume Chrome runs on Chrome OS devices.
+  # If this flag is set, we assume Chrome runs on Chrome OS devices, using
+  # Wayland (instead of X11).
   # TODO(crbug.com/1052397): After the clean up, this should be
   # replaced with 'target_os = "chromeos" && ui_mode == "browser"'.
   chromeos_is_browser_only = false