diff --git a/prometheus/histogram.go b/prometheus/histogram.go
index 41b51e365..8d35f2d8a 100644
--- a/prometheus/histogram.go
+++ b/prometheus/histogram.go
@@ -1373,7 +1373,7 @@ func MustNewConstHistogram(
 	return m
 }
 
-// NewConstHistogramWithCreatedTimestamp does the same thing as NewConstHistogram but sets the created timestamp
+// NewConstHistogramWithCreatedTimestamp does the same thing as NewConstHistogram but sets the created timestamp.
 func NewConstHistogramWithCreatedTimestamp(
 	desc *Desc,
 	count uint64,
diff --git a/prometheus/summary.go b/prometheus/summary.go
index 5cda7454c..1ab0e4796 100644
--- a/prometheus/summary.go
+++ b/prometheus/summary.go
@@ -784,7 +784,7 @@ func MustNewConstSummary(
 	return m
 }
 
-// NewConstSummaryWithCreatedTimestamp does the same thing as NewConstSummary but sets the created timestamp
+// NewConstSummaryWithCreatedTimestamp does the same thing as NewConstSummary but sets the created timestamp.
 func NewConstSummaryWithCreatedTimestamp(
 	desc *Desc,
 	count uint64,