diff --git a/null_handlers.go b/null_handlers.go
index 5156bd2..2213efa 100644
--- a/null_handlers.go
+++ b/null_handlers.go
@@ -7,6 +7,7 @@ import (
 	"time"
 )
 
+// NullIntHandler is a TypeHandler for null.Int
 func NullIntHandler(input string, value *Value) error {
 	// Get int64
 	res, err := strconv.ParseInt(input, 10, 64)
@@ -21,6 +22,7 @@ func NullIntHandler(input string, value *Value) error {
 	return nil
 }
 
+// NullStringHandler is a TypeHandler for null.String
 func NullStringHandler(input string, value *Value) error {
 	nullString := value.Result.(*null.String)
 	(*nullString).String = input
@@ -28,6 +30,7 @@ func NullStringHandler(input string, value *Value) error {
 	return nil
 }
 
+// NullFloatHandler is a TypeHandler for null.Float
 func NullFloatHandler(input string, value *Value) error {
 	// Get float64
 	res, err := strconv.ParseFloat(input, 64)
@@ -42,6 +45,7 @@ func NullFloatHandler(input string, value *Value) error {
 	return nil
 }
 
+// NullBoolHandler is a TypeHandler for null.Bool
 func NullBoolHandler(input string, value *Value) error {
 	// Get bool
 	res, err := strconv.ParseBool(input)
@@ -56,6 +60,7 @@ func NullBoolHandler(input string, value *Value) error {
 	return nil
 }
 
+// NullTimeHandler is a TypeHandler for null.Time
 func NullTimeHandler(input string, value *Value) error {
 	// Get time.Time
 	res, err := time.Parse(time.RFC3339, input)
diff --git a/validator.go b/validator.go
index a04c097..ddd07aa 100644
--- a/validator.go
+++ b/validator.go
@@ -1,7 +1,6 @@
 package validator
 
 import (
-	"errors"
 	"fmt"
 	"reflect"
 	"time"
@@ -68,7 +67,7 @@ func Validate(values []*Value) error {
 func applyTypeHandler(value *Value) error {
 	switch i := (value.Result).(type) {
 	default:
-		return errors.New(fmt.Sprintf("go-carrot/validator cannot by default handle a Value with Result of type %v.  Must set a custom TypeHandler for %v.", reflect.TypeOf(i), value.Name))
+		return fmt.Errorf("go-carrot/validator cannot by default handle a Value with Result of type %v.  Must set a custom TypeHandler for %v.", reflect.TypeOf(i), value.Name)
 	case *string:
 		value.TypeHandler = stringHandler
 	case *float32: