diff --git a/CHANGELOG.md b/CHANGELOG.md
index 93debcad0f7..e6b38dc03cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -112,6 +112,8 @@ release.
 - Add OpenCensus migration guide and add BinaryPropagation as an option to gRPC
   instrumentation for OpenCensus compatibility
   ([#3015](/~https://github.com/open-telemetry/opentelemetry-specification/pull/3015)).
+- Add condition with sum and count for Prometheus summaries
+([3059](/~https://github.com/open-telemetry/opentelemetry-specification/pull/3059))
 
 ### OpenTelemetry Protocol
 
diff --git a/specification/compatibility/prometheus_and_openmetrics.md b/specification/compatibility/prometheus_and_openmetrics.md
index 7d4370ae1d0..437c46bfd4a 100644
--- a/specification/compatibility/prometheus_and_openmetrics.md
+++ b/specification/compatibility/prometheus_and_openmetrics.md
@@ -103,6 +103,8 @@ Multiple Prometheus metrics are merged together into a single OTLP Summary:
 
 * The `quantile` label on non-suffixed metrics is used to identify quantile points in summary metrics. Each Prometheus line produces one quantile on the resulting summary.
 * Lines with `_count` and `_sum` suffixes are used to determine the summary's count and sum.
+* If `_count` is not present, the metric MUST be dropped.
+* If `_sum` is not present, the summary's sum MUST be [set to zero.](/~https://github.com/open-telemetry/opentelemetry-proto/blob/d8729d40f629dba12694b44c4c32c1eab109b00a/opentelemetry/proto/metrics/v1/metrics.proto#L601)
 
 ### Dropped Types