diff --git a/.env.example b/.env.example
index 16733da..5554240 100644
--- a/.env.example
+++ b/.env.example
@@ -19,3 +19,7 @@ SLOW_RETRY_MINUTES=60
 
 # Wikipedia language for the featured-article feed
 WIKIPEDIA_LANG=en
+
+# Optional: require ?token=<value> (or header trmnl-token: <value>) on
+# /trmnl.json so only your TRMNL device can poll it. Empty = open (public jokes).
+TRMNL_TOKEN=