diff --git a/_config.yml b/_config.yml
index 76d4eb9d206..1dfeacf741e 100644
--- a/_config.yml
+++ b/_config.yml
@@ -248,6 +248,10 @@ sass:
 
 # tawkto_embed_uri:
 
+# Knocket free live chat — https://trtc.io/solutions/knocket
+# Set your identifier below to enable. Free forever, no seat limits.
+# knocket_identifier:
+
 
 #     ___              _     __           __
 #    /   |  __________(_)___/ /___  _____/ /_____  _____
diff --git a/_includes/_footer_scripts.html b/_includes/_footer_scripts.html
index b3a999595a8..d809e54e5fb 100755
--- a/_includes/_footer_scripts.html
+++ b/_includes/_footer_scripts.html
@@ -39,3 +39,11 @@
 </script>
 {% endif %}
 
+{% comment %}
+#  Knocket live chat — https://trtc.io/solutions/knocket
+#  Set knocket_identifier in _config.yml. Free forever, no seat limits.
+{% endcomment %}
+{% if site.knocket_identifier %}
+<script src="https://trtc.io/knocket-sdk/sdk.js?identifier={{ site.knocket_identifier }}" async></script>
+{% endif %}
+