diff --git a/doc/manuals/chapters/gateware.adoc b/doc/manuals/chapters/gateware.adoc
index 03487e1..a515cb1 100644
--- a/doc/manuals/chapters/gateware.adoc
+++ b/doc/manuals/chapters/gateware.adoc
@@ -6,6 +6,9 @@
 picoRISCV soft-core running the [[firmware]] as well as the USB
 device peripheral talking to the host PC.
 
+The gateware is stored in binary form on the device-internal
+non-volatile memory (SPI flash).  It is field-upgradeable via USB.
+
 As an OSHW project, all of it is available in source code format
 at https://git.osmocom.org/osmo-e1-hardware/tree/gateware/icE1usb