diff --git a/plugins/cros-ec/README.md b/plugins/cros-ec/README.md
index 868483d8a..a16ac6dd0 100644
--- a/plugins/cros-ec/README.md
+++ b/plugins/cros-ec/README.md
@@ -19,6 +19,10 @@ Firmware Format
 The daemon will decompress the cabinet archive and extract a firmware blob in
 the Google fmap [3] file format.
 
+This plugin supports the following protocol ID:
+
+ * com.google.usb.crosec
+
 GUID Generation
 ---------------
 
diff --git a/plugins/cros-ec/fu-cros-ec-usb-device.c b/plugins/cros-ec/fu-cros-ec-usb-device.c
index 2cf5eab7d..0308d57f9 100644
--- a/plugins/cros-ec/fu-cros-ec-usb-device.c
+++ b/plugins/cros-ec/fu-cros-ec-usb-device.c
@@ -581,6 +581,7 @@ fu_cros_ec_usb_device_prepare_firmware (FuDevice *device,
 static void
 fu_cros_ec_usb_device_init (FuCrosEcUsbDevice *device)
 {
+	fu_device_set_protocol (FU_DEVICE (device), "com.google.usb.crosec");
 	fu_device_set_version_format (FU_DEVICE (device), FWUPD_VERSION_FORMAT_TRIPLET);
 }