diff --git a/sqlmock.go b/sqlmock.go
index 17cfd6c..01745f1 100644
--- a/sqlmock.go
+++ b/sqlmock.go
@@ -180,6 +180,7 @@ func (c *sqlmock) ExpectationsWereMet() error {
 	return nil
 }
 
+// CheckNamedValue meets https://golang.org/pkg/database/sql/driver/#NamedValueChecker
 func (c *sqlmock) CheckNamedValue(nv *driver.NamedValue) (err error) {
 	nv.Value, err = c.converter.ConvertValue(nv.Value)
 	return err