diff --git a/deploy/thermograph.env.example b/deploy/thermograph.env.example
index 2ed135f..d9a856e 100644
--- a/deploy/thermograph.env.example
+++ b/deploy/thermograph.env.example
@@ -82,3 +82,12 @@ THERMOGRAPH_BASE_URL=https://thermograph.org
 # The post rides the notifier daemon (leader-only), once per day after the feed
 # refresh, so it needs THERMOGRAPH_ENABLE_NOTIFIER on (the default).
 #THERMOGRAPH_DISCORD_WEBHOOK=
+# Slash commands (/grade) are served over Discord's HTTP interactions endpoint by
+# the app itself (no bot process). Set the portal's "Interactions Endpoint URL" to
+# https://thermograph.org/discord/interactions. These come from the Developer Portal:
+#   - PUBLIC_KEY: General Information -> Public Key (used to verify every request).
+#   - APP_ID / BOT_TOKEN: only needed to (re)register the commands, via
+#     scripts/register_discord_commands.py. The bot token is a credential.
+#THERMOGRAPH_DISCORD_PUBLIC_KEY=
+#THERMOGRAPH_DISCORD_APP_ID=
+#THERMOGRAPH_DISCORD_BOT_TOKEN=