--- a/README	Fri Jul 06 14:22:56 2018 +0200
+++ b/README	Tue Jul 10 13:06:09 2018 +0200
@@ -31,6 +31,15 @@
 Makefile for any macros you may need to override depending on the used
 toolchain and operating system.
 
+By default the "update-command" setting is empty which means users will not be
+offered to install updates from a notification or the indicator menu.
+Distribution vendors may override this or any other default setting by
+installing a vendor override file alongside the schema file.  An example for
+is distributed with package-update-indicator, see the file
+"examples/10_vendor_update_command.gschema.override.example".  For details on
+how to install a vendor override file see the manual page for
+glib-compile-schemas.
+
 By default, all files will be installed under the "/usr/local" directory, a
 different installation path prefix can be set via the `prefix` macro.  In
 addition, a second path prefix can be specified via the `DESTDIR` macro which