diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6f6eb8152b1..390a66069bc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,8 @@ release.
   ([#3242](https://github.com/open-telemetry/opentelemetry-specification/pull/3242))
 - Promote MetricProducer specification to feature-freeze.
   ([#3600](https://github.com/open-telemetry/opentelemetry-specification/pull/3600))
+- Metric namespaces SHOULD NOT be pluralized.
+  ([#3663](https://github.com/open-telemetry/opentelemetry-specification/pull/3663))
 
 ### Logs
 
diff --git a/specification/metrics/semantic_conventions/README.md b/specification/metrics/semantic_conventions/README.md
index 1bd0f041437..c6d7e576b8a 100644
--- a/specification/metrics/semantic_conventions/README.md
+++ b/specification/metrics/semantic_conventions/README.md
@@ -106,6 +106,8 @@ using the OpenMetrics exposition format, use the
 
 ### Pluralization
 
+Metric namespaces SHOULD NOT be pluralized.
+
 Metric names SHOULD NOT be pluralized, unless the value being recorded
 represents discrete instances of a
 [countable quantity](https://en.wikipedia.org/wiki/Count_noun).