diff --git a/lib/libesp32/berry_matter/src/embedded/Matter_Plugin_2_OnOff.be b/lib/libesp32/berry_matter/src/embedded/Matter_Plugin_2_OnOff.be
index ad66d4c75..a2966c7c6 100644
--- a/lib/libesp32/berry_matter/src/embedded/Matter_Plugin_2_OnOff.be
+++ b/lib/libesp32/berry_matter/src/embedded/Matter_Plugin_2_OnOff.be
@@ -46,6 +46,7 @@ class Matter_Plugin_OnOff : Matter_Plugin_Device
   # var clusters                                      # map from cluster to list of attributes, typically constructed from CLUSTERS hierachy
   # var tick                                          # tick value when it was last updated
   # var node_label                                    # name of the endpoint, used only in bridge mode, "" if none
+  var shadow_onoff                                    # (bool) status of the light power on/off
   var tasmota_relay_index                             # Relay number in Tasmota (zero based)
 
   #############################################################