diff --git a/model/histogram/float_histogram.go b/model/histogram/float_histogram.go
index 54ff5d4df..f1cb6e5a9 100644
--- a/model/histogram/float_histogram.go
+++ b/model/histogram/float_histogram.go
@@ -307,6 +307,7 @@ func (h *FloatHistogram) Sub(other *FloatHistogram) *FloatHistogram {
 // Exact match is when there are no new buckets (even empty) and no missing buckets,
 // and all the bucket values match. Spans can have different empty length spans in between,
 // but they must represent the same bucket layout to match.
+// Non-metadata float fields (Sum, Count, ZeroCount) are compared as binary (using math.Float64bits).
 func (h *FloatHistogram) Equals(h2 *FloatHistogram) bool {
 	if h2 == nil {
 		return false
diff --git a/model/histogram/histogram.go b/model/histogram/histogram.go
index 31c3ce9fe..88883472d 100644
--- a/model/histogram/histogram.go
+++ b/model/histogram/histogram.go
@@ -172,6 +172,7 @@ func (h *Histogram) CumulativeBucketIterator() BucketIterator[uint64] {
 // Exact match is when there are no new buckets (even empty) and no missing buckets,
 // and all the bucket values match. Spans can have different empty length spans in between,
 // but they must represent the same bucket layout to match.
+// Non-metadata float field (Sum) is compared as binary (using math.Float64bits).
 func (h *Histogram) Equals(h2 *Histogram) bool {
 	if h2 == nil {
 		return false