From 29bd644110890823fa51a290b502129f6624b4cf Mon Sep 17 00:00:00 2001
From: Birte Kristina Friesel <derf@finalrewind.org>
Date: Mon, 8 Jan 2024 18:20:47 +0100
Subject: README: influx_attr must be empty or start with a comma

---
 README.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 4632a7d..9984a08 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,7 @@ station_cfg.pwd = "..."
 mqtt_host = "..."
 ```
 
-Optionally, it can also publish readings to an InfluxDB.
+Optionally, it can also publish readings to InfluxDB.
 To do so, configure URL and attribute:
 
 ```lua
@@ -119,4 +119,5 @@ influx_url = "..."
 influx_attr = "..."
 ```
 
-Readings will be stored as `sds011,[influx_attr] pm2_5_ugm3=...,pm10_ugm3=...`
+Readings will be published as `sds011[influx_attr] pm2_5_ugm3=...,pm10_ugm3=...`
+So, unless `influx_attr = ''`, it must start with a comma, e.g. `influx_attr = ',device=' .. device_id`.
-- 
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