diff --git a/CHANGELOG.md b/CHANGELOG.md
index deb2e78f9e..01956be577 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -74,3 +74,5 @@ release.
   attributes for GCP Compute Engine VMs. ([#15](https://github.com/open-telemetry/semantic-conventions/pull/15))
 - Add note that HTTP duration metrics should match HTTP span duration.
   ([#69](https://github.com/open-telemetry/semantic-conventions/pull/69))
+- Add `system.cpu.count` metric.
+  ([#0](https://github.com/open-telemetry/opentelemetry-specification/pull/0))
diff --git a/specification/metrics/semantic_conventions/system-metrics.md b/specification/metrics/semantic_conventions/system-metrics.md
index 14aed3760e..6813c38bd5 100644
--- a/specification/metrics/semantic_conventions/system-metrics.md
+++ b/specification/metrics/semantic_conventions/system-metrics.md
@@ -39,6 +39,7 @@ instruments not explicitly defined in the specification.
 |                        |                                                                                                          |       |                                                   |            | cpu              | CPU number [0..n-1]                 |
 | system.cpu.utilization | Difference in system.cpu.time since the last measurement, divided by the elapsed time and number of CPUs | 1     | Gauge                                             | Double     | state            | idle, user, system, interrupt, etc. |
 |                        |                                                                                                          |       |                                                   |            | cpu              | CPU number (0..n)                   |
+| system.cpu.count       | Reports the and number of available CPUs - may changes over time                                         | 1     | UpDownCounters                                    | Int64      | device           | (identifier e.g. `machine-id`)      |
 
 ### `system.memory.` - Memory metrics