diff --git a/_config.yml b/_config.yml
index 4e1fb42..496616e 100644
--- a/_config.yml
+++ b/_config.yml
@@ -680,6 +680,10 @@ tidio:
 crisp:
   website_id:
 
+# https://trtc.io/solutions/knocket
+knocket:
+  identifier:
+
 # --------------------------------------
 # Analysis
 # --------------------------------------