From 77bb3ddf62faf8103c8ad99c2886b23db4f8b3b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torkel=20=C3=96degaard?= <torkel@grafana.com>
Date: Tue, 29 Jan 2019 20:53:49 +0100
Subject: [PATCH] Added basic docs

---
 docs/sources/reference/templating.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/docs/sources/reference/templating.md b/docs/sources/reference/templating.md
index 3ef32b1b10f..340384b62e5 100644
--- a/docs/sources/reference/templating.md
+++ b/docs/sources/reference/templating.md
@@ -245,6 +245,11 @@ summarize($myinterval, sum, false)
 
 Grafana has global built-in variables that can be used in expressions in the query editor.
 
+### Time range variables
+
+Grafana has two built in time range variables in `$__from` and `$__to`. They are currently always interpolated
+as epoch milliseconds.
+
 ### The $__interval Variable
 
 This $__interval variable is similar to the `auto` interval variable that is described above. It can be used as a parameter to group by time (for InfluxDB, MySQL, Postgres, MSSQL), Date histogram interval (for Elasticsearch) or as a *summarize* function parameter (for Graphite).