diff --git a/.env.example b/.env.example
index 68f0917..4132a20 100644
--- a/.env.example
+++ b/.env.example
@@ -53,7 +53,10 @@ APP_PORT=3000
 # are optional.
 # DISCORD_TOKEN=
 # DISCORD_GUILD_ID=
+# Roll call: mission attendance embeds and roll-call posts go here (ops channel).
 # DISCORD_OPS_CHANNEL_ID=
+# App updates: where /announce posts when no channel is given; also the
+# channel preselected in the /announce compose dialog.
 # DISCORD_ANNOUNCE_CHANNEL_ID=
 # DISCORD_STAFF_ROLE_IDS=
 # DISCORD_ATTENDANCE_POLL_MS=