diff --git a/spanner/mutation.go b/spanner/mutation.go
index 0d64d9b04d9..a0d1466b6ac 100644
--- a/spanner/mutation.go
+++ b/spanner/mutation.go
@@ -119,6 +119,8 @@ const (
 //     []time.Time, []*time.Time, []NullTime - TIMESTAMP ARRAY
 //     Date, *Date, NullDate - DATE
 //     []Date, []*Date, []NullDate - DATE ARRAY
+//     big.Rat, *big.Rat, NullNumeric - NUMERIC
+//     []big.Rat, []*big.Rat, []NullNumeric - NUMERIC ARRAY
 //
 // To compare two Mutations for testing purposes, use reflect.DeepEqual.
 type Mutation struct {
diff --git a/spanner/value.go b/spanner/value.go
index 8ed147e36de..eb2a873a715 100644
--- a/spanner/value.go
+++ b/spanner/value.go
@@ -3067,6 +3067,7 @@ func isSupportedMutationType(v interface{}) bool {
 		float64, *float64, []float64, []*float64, NullFloat64, []NullFloat64,
 		time.Time, *time.Time, []time.Time, []*time.Time, NullTime, []NullTime,
 		civil.Date, *civil.Date, []civil.Date, []*civil.Date, NullDate, []NullDate,
+		big.Rat, *big.Rat, []big.Rat, []*big.Rat, NullNumeric, []NullNumeric,
 		GenericColumnValue:
 		return true
 	default: