Review comments

prometheus/histogram.go

@@ -1884,9 +1884,11 @@ func validateCount(sum float64, count uint64, negativeBuckets, positiveBuckets m
 // index of the bucket according to the used
 // Schema. Index 0 is for an upper bound of 1 in positive buckets and for a lower bound of -1 in negative buckets.
 // NewConstNativeHistogram returns an error if
-//  - the length of labelValues is not consistent with the variable labels in Desc or if Desc is invalid.
-//  - the schema passed is not between 8 and -4
-//  - the sum of counts in all buckets including the zero bucket does not equal the count if sum is not NaN (or exceeds the count if sum is NaN)
+//   - the length of labelValues is not consistent with the variable labels in Desc or if Desc is invalid.
+//   - the schema passed is not between 8 and -4
+//   - the sum of counts in all buckets including the zero bucket does not equal the count if sum is not NaN (or exceeds the count if sum is NaN)
+//
+// See https://opentelemetry.io/docs/specs/otel/compatibility/prometheus_and_openmetrics/#exponential-histograms for more details about the conversion from OTel to Prometheus.
 func NewConstNativeHistogram(
 	desc *Desc,
 	count uint64,
@@ -1941,6 +1943,8 @@ func NewConstNativeHistogram(
 	return ret, nil
 }
 
+// MustNewConstNativeHistogram is a version of NewConstNativeHistogram that panics where
+// NewConstNativeHistogram would have returned an error.
 func MustNewConstNativeHistogram(
 	desc *Desc,
 	count uint64,