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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -46,6 +46,8 @@ release.
([#4002](https://github.com/open-telemetry/opentelemetry-specification/pull/4002))
- Add end to end examples for file configuration
([#4018](https://github.com/open-telemetry/opentelemetry-specification/pull/4018))
- Clarify the schema for YAML configuration files
([#3973](https://github.com/open-telemetry/opentelemetry-specification/pull/3973))

### Common

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2 changes: 2 additions & 0 deletions specification/configuration/file-configuration.md
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Expand Up @@ -65,6 +65,8 @@ Configuration files SHOULD use one the following serialization formats:
[YAML](https://yaml.org/spec/1.2.2/) configuration files SHOULD follow YAML spec
revision >= 1.2.

YAML configuration files SHOULD be parsed using [v1.2 YAML core schema](https://yaml.org/spec/1.2.2/#103-core-schema).

YAML configuration files MUST use file extensions `.yaml` or `.yml`.

### Environment variable substitution
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