diff --git a/docs/sources/features/datasources/prometheus.md b/docs/sources/features/datasources/prometheus.md
index 190220fb0f1..0ed9e108df6 100644
--- a/docs/sources/features/datasources/prometheus.md
+++ b/docs/sources/features/datasources/prometheus.md
@@ -76,7 +76,11 @@ Name | Description
 For details of *metric names*, *label names* and *label values* are please refer to the [Prometheus documentation](http://prometheus.io/docs/concepts/data_model/#metric-names-and-labels).
 
 
-It is possible to use some global template variables in Prometheus query template variables; `$__interval`, `$__interval_ms`, `$__range` and `$__range_ms`, where `$__range` is the dashboard's current time range and `$__range_ms` is the current range in milliseconds.
+#### Using interval and range variables
+
+> Support for `$__range` and `$__range_ms` only available from Grafana v5.3
+
+It's possible to use some global template variables in Prometheus query template variables; `$__interval`, `$__interval_ms`, `$__range` and `$__range_ms`, where `$__range` is the dashboard's current time range and `$__range_ms` is the current range in milliseconds.
 
 ### Using variables in queries
 
diff --git a/docs/sources/reference/templating.md b/docs/sources/reference/templating.md
index 08a142d3636..ce1a1299d26 100644
--- a/docs/sources/reference/templating.md
+++ b/docs/sources/reference/templating.md
@@ -274,6 +274,9 @@ The `$__timeFilter` is used in the MySQL data source.
 This variable is only available in the Singlestat panel and can be used in the prefix or suffix fields on the Options tab. The variable will be replaced with the series name or alias.
 
 ### The $__range Variable
+
+> Only available in Grafana v5.3+
+
 Currently only supported for Prometheus data sources. This variable represents the range for the current dashboard. It is calculated by `to - from`. It has a millisecond representation called `$__range_ms`.
 
 ## Repeating Panels