diff --git a/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/README.md b/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/README.md
index 2f4d0639e4d..5f39d810b80 100644
--- a/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/README.md
+++ b/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/README.md
@@ -18,7 +18,11 @@ dotnet add package OpenTelemetry.Exporter.OpenTelemetryProtocol
 
 ## Configuration
 
-You can configure the `OtlpExporter` through `OtlpExporterOptions` properties:
+You can configure the `OtlpExporter` through `OtlpExporterOptions`
+properties and environment variables. The `OtlpExporterOptions`
+setters take precedence over the environment variables.
+
+## Options Properties
 
 * `Endpoint`: Target to which the exporter is going to send traces or metrics.
   The endpoint must be a valid Uri with scheme (http or https) and host, and MAY
@@ -35,6 +39,18 @@ You can configure the `OtlpExporter` through `OtlpExporterOptions` properties:
 See the [`TestOtlpExporter.cs`](../../examples/Console/TestOtlpExporter.cs) for
 an example of how to use the exporter.
 
+## Environment Variables
+
+The following environment variables can be used to override the default
+values of the `OtlpExporterOptions`
+(following the [OpenTelemetry specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md)).
+
+| Environment variable          | `OtlpExporterOptions` property |
+| ------------------------------| -------------------------------|
+| `OTEL_EXPORTER_OTLP_ENDPOINT` | `Endpoint`                     |
+| `OTEL_EXPORTER_OTLP_HEADERS`  | `Headers`                      |
+| `OTEL_EXPORTER_OTLP_TIMEOUT`  | `TimeoutMilliseconds`          |
+
 ## Special case when using insecure channel
 
 If your application is [.NET Standard