diff --git a/certificate.go b/certificate.go
index acde889..5202f22 100644
--- a/certificate.go
+++ b/certificate.go
@@ -10,19 +10,19 @@ import (
 	"github.com/go-sql-driver/mysql"
 )
 
-// Certificate is the certificates for connecting RDS MySQL with SSL/TLS.
+// Certificates is the certificates for connecting RDS MySQL with SSL/TLS.
 // It contains the intermediate and root certificates for [Amazon RDS MySQL] and [Amazon Aurora MySQL].
 //
 // [Amazon RDS MySQL]: https://docs.aws.amazon.com/ja_jp/AmazonRDS/latest/UserGuide/UsingWithRDS.SSL.html
 // [Amazon Aurora MySQL]: https://docs.aws.amazon.com/ja_jp/AmazonRDS/latest/AuroraUserGuide/UsingWithRDS.SSL.html
-const Certificate = rdsCertificates
+const Certificates = rdsCertificates
 
 // TLSConfig is the tls.TLSConfig for connecting RDS MySQL with SSL/TLS.
 var TLSConfig *tls.Config
 
 func init() {
 	rootCertPool := x509.NewCertPool()
-	if ok := rootCertPool.AppendCertsFromPEM([]byte(Certificate)); !ok {
+	if ok := rootCertPool.AppendCertsFromPEM([]byte(Certificates)); !ok {
 		panic(errors.New("failed to append certs"))
 	}
 	TLSConfig = &tls.Config{
diff --git a/certificate_test.go b/certificate_test.go
index 6c29400..6f3c499 100644
--- a/certificate_test.go
+++ b/certificate_test.go
@@ -9,7 +9,7 @@ import (
 func TestCertificate(t *testing.T) {
 	t.Parallel()
 
-	pemCerts := []byte(Certificate)
+	pemCerts := []byte(Certificates)
 	for len(pemCerts) > 0 {
 		var block *pem.Block
 		block, pemCerts = pem.Decode(pemCerts)
diff --git a/internal/config/config.go b/internal/config/config.go
index 6f926a5..b61e66b 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -41,7 +41,7 @@ enable-cleartext-plugin
 	if err := os.WriteFile(fmt.Sprintf("%s.%d", confpath, now.UnixNano()), []byte(conf), 0600); err != nil {
 		return err
 	}
-	if err := os.WriteFile(fmt.Sprintf("%s.%d", pempath, now.UnixNano()), []byte(rdsmysql.Certificate), 0600); err != nil {
+	if err := os.WriteFile(fmt.Sprintf("%s.%d", pempath, now.UnixNano()), []byte(rdsmysql.Certificates), 0600); err != nil {
 		return err
 	}
 
diff --git a/v2/certificate.go b/v2/certificate.go
index acde889..5202f22 100644
--- a/v2/certificate.go
+++ b/v2/certificate.go
@@ -10,19 +10,19 @@ import (
 	"github.com/go-sql-driver/mysql"
 )
 
-// Certificate is the certificates for connecting RDS MySQL with SSL/TLS.
+// Certificates is the certificates for connecting RDS MySQL with SSL/TLS.
 // It contains the intermediate and root certificates for [Amazon RDS MySQL] and [Amazon Aurora MySQL].
 //
 // [Amazon RDS MySQL]: https://docs.aws.amazon.com/ja_jp/AmazonRDS/latest/UserGuide/UsingWithRDS.SSL.html
 // [Amazon Aurora MySQL]: https://docs.aws.amazon.com/ja_jp/AmazonRDS/latest/AuroraUserGuide/UsingWithRDS.SSL.html
-const Certificate = rdsCertificates
+const Certificates = rdsCertificates
 
 // TLSConfig is the tls.TLSConfig for connecting RDS MySQL with SSL/TLS.
 var TLSConfig *tls.Config
 
 func init() {
 	rootCertPool := x509.NewCertPool()
-	if ok := rootCertPool.AppendCertsFromPEM([]byte(Certificate)); !ok {
+	if ok := rootCertPool.AppendCertsFromPEM([]byte(Certificates)); !ok {
 		panic(errors.New("failed to append certs"))
 	}
 	TLSConfig = &tls.Config{
diff --git a/v2/certificate_test.go b/v2/certificate_test.go
index 6c29400..6f3c499 100644
--- a/v2/certificate_test.go
+++ b/v2/certificate_test.go
@@ -9,7 +9,7 @@ import (
 func TestCertificate(t *testing.T) {
 	t.Parallel()
 
-	pemCerts := []byte(Certificate)
+	pemCerts := []byte(Certificates)
 	for len(pemCerts) > 0 {
 		var block *pem.Block
 		block, pemCerts = pem.Decode(pemCerts)
diff --git a/v2/internal/config/config.go b/v2/internal/config/config.go
index cc207eb..e4ff375 100644
--- a/v2/internal/config/config.go
+++ b/v2/internal/config/config.go
@@ -40,7 +40,7 @@ enable-cleartext-plugin
 	if err := os.WriteFile(fmt.Sprintf("%s.%d", confpath, now.UnixNano()), []byte(conf), 0600); err != nil {
 		return err
 	}
-	if err := os.WriteFile(fmt.Sprintf("%s.%d", pempath, now.UnixNano()), []byte(rdsmysql.Certificate), 0600); err != nil {
+	if err := os.WriteFile(fmt.Sprintf("%s.%d", pempath, now.UnixNano()), []byte(rdsmysql.Certificates), 0600); err != nil {
 		return err
 	}