diff --git a/Enable-802.11mc-FTM-on-Intel-8260.md b/Enable-802.11mc-FTM-on-Intel-8260.md
index 21325ee..46f7814 100644
--- a/Enable-802.11mc-FTM-on-Intel-8260.md
+++ b/Enable-802.11mc-FTM-on-Intel-8260.md
@@ -39,6 +39,8 @@ Before make, we need to change the code so that FTM responder mode is enabled (t
 ```
 Also move the entire `static int nl80211_start_ftm_responder(struct sk_buff *skb, struct genl_info *info)` function above `nl80211_start_ap`.
 
+And then, in `drivers/net/wireless/intel/iwlwifi/mvm/constants.h`, change `#define IWL_MVM_TOF_IS_RESPONDER` to `1`.
+
 We are now ready to make & install:
 ```
 $ make -j4