--- a/ui/gtk/button.h	Fri Oct 10 09:05:11 2025 +0200
+++ b/ui/gtk/button.h	Fri Oct 10 09:06:06 2025 +0200
@@ -55,6 +55,7 @@
         UiObject *obj,
         const char *label,
         const char *icon,
+        const char *tooltip,
         ui_callback onclick,
         void *userdata,
         int event_value,
@@ -65,6 +66,7 @@
         GtkWidget *togglebutton,
         const char *label,
         const char *icon,
+        const char *tooltip,
         const char *varname,
         UiInteger *value,
         ui_callback onchange,