diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4e3309a2..c4a3b141e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,9 @@ release.
 
 ### Features
 
+- Metric namespaces SHOULD NOT be pluralized.
+  ([#267](https://github.com/open-telemetry/opentelemetry-specification/pull/267))
+
 ### Fixes
 
 - Clarify that `error.type` should be the fully-qualified exception class name
diff --git a/docs/general/metrics.md b/docs/general/metrics.md
index 6defc732a..c5446df65 100644
--- a/docs/general/metrics.md
+++ b/docs/general/metrics.md
@@ -105,6 +105,8 @@ 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).