diff --git a/tests/upgrade_boot.pm b/tests/upgrade_boot.pm
index 1d0b0835..f20d5071 100644
--- a/tests/upgrade_boot.pm
+++ b/tests/upgrade_boot.pm
@@ -17,6 +17,11 @@ sub run {
 
     boot_to_login_screen;
 
+    # If we want to test system upgrade via GUI, we need to make sure
+    # that Gnome Software allows to see prerelease upgrades, too. 
+    # We want to deal with it here, in order to save one restart
+    # between the steps.
+
     if (get_var("GUI_UPGRADE")) {
         # Log onto the graphical session
         my $login = get_var("USER_LOGIN") // "test";