diff --git a/docs/sources/configuration/_index.md b/docs/sources/configuration/_index.md
index 764238240fb5..959fed4d26ff 100644
--- 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: