diff --git a/README.md b/README.md
index 237a3f0..7266bd7 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 To flash: `make run0` runs against /dev/ttyUSB0 on `misbah`, Martin's basement
 chromebox, to flash with whatever parameters are configured in the Makefile.
 
+## Config mode
 After flashing: you can run the following segment to turn a freshly flashed
 Gluon router into a configured one; notably, this reconfigures WAN to be
 uplink+mesh, not just uplink:
@@ -19,3 +20,7 @@ gluon-reconfigure
 reboot
 ```
 
+Note: it's also possible to skip config mode by using `setup_mode : package` in
+site.conf.  See https://gluon.readthedocs.io/en/latest/user/site.html,
+`setup_mode : package` section.
+