diff --git a/content/en/tracing/metrics/runtime_metrics/_index.md b/content/en/tracing/metrics/runtime_metrics/_index.md
index 8bc7c416903df..dc19551b30e9e 100644
--- a/content/en/tracing/metrics/runtime_metrics/_index.md
+++ b/content/en/tracing/metrics/runtime_metrics/_index.md
@@ -163,6 +163,10 @@ Use the following environment variables to configure runtime metrics in your app
 : **Default**: `true` for Java, `false` for all other languages <br>
 **Description**: Enables the collection of runtime metrics. Metrics are sent to the Datadog agent, as configured for the instrumented application.
 
+`DD_RUNTIME_ID_ENABLED`
+: **Default**: `false` for Node.js, Ruby and Python languages <br>
+**Description**: Enables enhanced runtime metrics, providing a `runtime_id` tag along with every metric. The `runtime_id` represents the application's process identifier and allows you to directly correlate runtime metrics with individual running applications.
+
 `DD_AGENT_HOST`
 : **Default**: `localhost` <br>
 **Description**: Sets the host address for the tracing library's metric submission. Can be a hostname or an IP address.