diff --git a/lib/Crypt/PK/Ed25519.pm b/lib/Crypt/PK/Ed25519.pm
index c821654..32abf9e 100644
--- a/lib/Crypt/PK/Ed25519.pm
+++ b/lib/Crypt/PK/Ed25519.pm
@@ -307,6 +307,22 @@
  #or
  my $public_pem = $pk->export_key_pem('public');
 
+Support for password protected PEM keys
+
+ my $private_pem = $pk->export_key_pem('private', $password);
+ #or
+ my $private_pem = $pk->export_key_pem('private', $password, $cipher);
+
+ # supported ciphers: 'DES-CBC'
+ #                    'DES-EDE3-CBC'
+ #                    'SEED-CBC'
+ #                    'CAMELLIA-128-CBC'
+ #                    'CAMELLIA-192-CBC'
+ #                    'CAMELLIA-256-CBC'
+ #                    'AES-128-CBC'
+ #                    'AES-192-CBC'
+ #                    'AES-256-CBC' (DEFAULT)
+
 =head2 export_key_jwk
 
 Exports public/private keys as a JSON Web Key (JWK).
diff --git a/lib/Crypt/PK/X25519.pm b/lib/Crypt/PK/X25519.pm
index cb5ae6e..b4a26d3 100644
--- a/lib/Crypt/PK/X25519.pm
+++ b/lib/Crypt/PK/X25519.pm
@@ -264,6 +264,22 @@
  #or
  my $public_pem = $pk->export_key_pem('public');
 
+Support for password protected PEM keys
+
+ my $private_pem = $pk->export_key_pem('private', $password);
+ #or
+ my $private_pem = $pk->export_key_pem('private', $password, $cipher);
+
+ # supported ciphers: 'DES-CBC'
+ #                    'DES-EDE3-CBC'
+ #                    'SEED-CBC'
+ #                    'CAMELLIA-128-CBC'
+ #                    'CAMELLIA-192-CBC'
+ #                    'CAMELLIA-256-CBC'
+ #                    'AES-128-CBC'
+ #                    'AES-192-CBC'
+ #                    'AES-256-CBC' (DEFAULT)
+
 =head2 export_key_jwk
 
 Exports public/private keys as a JSON Web Key (JWK).