diff --git a/specification/trace/semantic_conventions/instrumentation/aws-lambda.md b/specification/trace/semantic_conventions/instrumentation/aws-lambda.md
index 9814df780..e61ec2822 100644
--- a/specification/trace/semantic_conventions/instrumentation/aws-lambda.md
+++ b/specification/trace/semantic_conventions/instrumentation/aws-lambda.md
@@ -218,3 +218,17 @@ have a parent of `Span Lambda`. This means the hierarchy looks like:
 Span Lambda --> Span ProcBatch --> Span Proc1 (links to Span Prod1 and Span Prod2)
                                \-> Span Proc2 (links to Span Prod1 and Span Prod2)
 ```
+
+## Resource Detector
+
+AWS Lambda resource information is available as [environment variables][] provided by the runtime.
+
+- [`cloud.provider`](../../../resource/semantic_conventions/cloud.md) MUST be set to `aws`
+- [`cloud.region`](../../../resource/semantic_conventions/cloud.md) MUST be set to the value of the `AWS_REGION` environment variable
+- [`faas.name`](../../../resource/semantic_conventions/faas.md) MUST be set to the value of the `AWS_LAMBDA_FUNCTION_NAME` environment variable
+- [`faas.version`](../../../resource/semantic_conventions/faas.md) MUST be set to the value of the `AWS_LAMBDA_FUNCTION_VERSION` environment variable
+
+Note that [`faas.id`](../../../resource/semantic_conventions/faas.md) currently cannot be populated to resource
+because it is not available until function invocation.
+
+[environment variables]: https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html#configuration-envvars-runtime