diff --git a/website/docs/cli/config/environment-variables.mdx b/website/docs/cli/config/environment-variables.mdx
index 40bd825732..9453c5a209 100644
--- a/website/docs/cli/config/environment-variables.mdx
+++ b/website/docs/cli/config/environment-variables.mdx
@@ -151,6 +151,8 @@ The location of the [Terraform CLI configuration file](/terraform/cli/config/con
 export TF_CLI_CONFIG_FILE="$HOME/.terraformrc-custom"
 ```
 
+(Note that `TERRAFORM_CONFIG` is a deprecated alias for this variable. Please do not use `TERRAFORM_CONFIG` as it may be removed in future versions of Terraform.)
+
 ## TF_PLUGIN_CACHE_DIR
 
 The `TF_PLUGIN_CACHE_DIR` environment variable is an alternative way to set [the `plugin_cache_dir` setting in the CLI configuration](/terraform/cli/config/config-file#provider-plugin-cache).