diff --git a/phpseclib/Crypt/AES.php b/phpseclib/Crypt/AES.php
index 23ea6e14..ccbafef2 100644
--- a/phpseclib/Crypt/AES.php
+++ b/phpseclib/Crypt/AES.php
@@ -25,7 +25,7 @@
  * <?php
  *    include 'vendor/autoload.php';
  *
- *    $aes = new \phpseclib3\Crypt\AES();
+ *    $aes = new \phpseclib3\Crypt\AES('ctr');
  *
  *    $aes->setKey('abcdefghijklmnop');
  *
diff --git a/phpseclib/Crypt/Blowfish.php b/phpseclib/Crypt/Blowfish.php
index c75d983a..825efcfc 100644
--- a/phpseclib/Crypt/Blowfish.php
+++ b/phpseclib/Crypt/Blowfish.php
@@ -16,7 +16,7 @@
  * <?php
  *    include 'vendor/autoload.php';
  *
- *    $blowfish = new \phpseclib3\Crypt\Blowfish();
+ *    $blowfish = new \phpseclib3\Crypt\Blowfish('ctr');
  *
  *    $blowfish->setKey('12345678901234567890123456789012');
  *
diff --git a/phpseclib/Crypt/DES.php b/phpseclib/Crypt/DES.php
index cbde382f..ed6fb62e 100644
--- a/phpseclib/Crypt/DES.php
+++ b/phpseclib/Crypt/DES.php
@@ -18,7 +18,7 @@
  * <?php
  *    include 'vendor/autoload.php';
  *
- *    $des = new \phpseclib3\Crypt\DES();
+ *    $des = new \phpseclib3\Crypt\DES('ctr');
  *
  *    $des->setKey('abcdefgh');
  *
diff --git a/phpseclib/Crypt/RC2.php b/phpseclib/Crypt/RC2.php
index 813eeca4..3f337d97 100644
--- a/phpseclib/Crypt/RC2.php
+++ b/phpseclib/Crypt/RC2.php
@@ -16,7 +16,7 @@
  * <?php
  *    include 'vendor/autoload.php';
  *
- *    $rc2 = new \phpseclib3\Crypt\RC2();
+ *    $rc2 = new \phpseclib3\Crypt\RC2('ctr');
  *
  *    $rc2->setKey('abcdefgh');
  *
diff --git a/phpseclib/Crypt/Rijndael.php b/phpseclib/Crypt/Rijndael.php
index 91c3b5c6..c0b37092 100644
--- a/phpseclib/Crypt/Rijndael.php
+++ b/phpseclib/Crypt/Rijndael.php
@@ -30,7 +30,7 @@
  * <?php
  *    include 'vendor/autoload.php';
  *
- *    $rijndael = new \phpseclib3\Crypt\Rijndael();
+ *    $rijndael = new \phpseclib3\Crypt\Rijndael('ctr');
  *
  *    $rijndael->setKey('abcdefghijklmnop');
  *
diff --git a/phpseclib/Crypt/TripleDES.php b/phpseclib/Crypt/TripleDES.php
index 2c98d639..6e640392 100644
--- a/phpseclib/Crypt/TripleDES.php
+++ b/phpseclib/Crypt/TripleDES.php
@@ -12,7 +12,7 @@
  * <?php
  *    include 'vendor/autoload.php';
  *
- *    $des = new \phpseclib3\Crypt\TripleDES();
+ *    $des = new \phpseclib3\Crypt\TripleDES('ctr');
  *
  *    $des->setKey('abcdefghijklmnopqrstuvwx');
  *
diff --git a/phpseclib/Crypt/Twofish.php b/phpseclib/Crypt/Twofish.php
index c9cc5b46..136708e3 100644
--- a/phpseclib/Crypt/Twofish.php
+++ b/phpseclib/Crypt/Twofish.php
@@ -16,7 +16,7 @@
  * <?php
  *    include 'vendor/autoload.php';
  *
- *    $twofish = new \phpseclib3\Crypt\Twofish();
+ *    $twofish = new \phpseclib3\Crypt\Twofish('ctr');
  *
  *    $twofish->setKey('12345678901234567890123456789012');
  *