From af3d75ebd39129c170a7b5c03262dc28afddb8b1 Mon Sep 17 00:00:00 2001
From: Martin <github@mrvanes.com>
Date: Wed, 20 Feb 2019 14:05:12 +0100
Subject: [PATCH] Update history_graph.markdown (#8648)

* Update history_graph.markdown

I couldn't understand why my MQTT temperuture sensor wouldn't combine with my weather sensor until I noticed the proposed change.

* Minor changes
---
 source/_components/history_graph.markdown | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/source/_components/history_graph.markdown b/source/_components/history_graph.markdown
index a929385fa18..42a8fe79046 100644
--- a/source/_components/history_graph.markdown
+++ b/source/_components/history_graph.markdown
@@ -71,7 +71,6 @@ history_graph:
       - sensor.inside_temperature
     hours_to_show: 120
     # refresh: 0
-
 ```
 
-
+For sensors to automatically be combined into one graph they need to have exactly the same unit of measurement. This is important if you have, e.g., a unit-less temperature `state_topic` MQTT sensor and you want to combine this with a weather sensor. `unit_of_measurement:` of the MQTT sensor then needs to be set to `°C`.