Update _index.md (#3032)

grafana · Dec 4, 2020 · 72b4c01 · 72b4c01
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diff --git a/docs/sources/configuration/_index.md b/docs/sources/configuration/_index.md
@@ -66,6 +66,8 @@ non-list parameters the value is set to the specified default.
 
 ### Use environment variables in the configuration
 
+> **Note:** This feature is only available in Loki 2.1+.
+
 You can use environment variable references in the configuration file to set values that need to be configurable during deployment.
 To do this, use: