diff --git a/phpseclib/Crypt/DH/PrivateKey.php b/phpseclib/Crypt/DH/PrivateKey.php
index 8756b419..fd92165a 100644
--- a/phpseclib/Crypt/DH/PrivateKey.php
+++ b/phpseclib/Crypt/DH/PrivateKey.php
@@ -47,7 +47,7 @@ class PrivateKey extends DH
      * Returns the public key
      *
      * @access public
-     * @return DH
+     * @return DH\PublicKey
      */
     public function getPublicKey()
     {
diff --git a/phpseclib/Crypt/EC/Curves/Ed25519.php b/phpseclib/Crypt/EC/Curves/Ed25519.php
index d4c3e37a..a34494ce 100644
--- a/phpseclib/Crypt/EC/Curves/Ed25519.php
+++ b/phpseclib/Crypt/EC/Curves/Ed25519.php
@@ -331,4 +331,4 @@ class Ed25519 extends TwistedEdwards
 
         return [$x3, $y3, $z3, $t3];
     }
-}
\ No newline at end of file
+}
diff --git a/phpseclib/Crypt/EC/Formats/Keys/Common.php b/phpseclib/Crypt/EC/Formats/Keys/Common.php
index 1993002f..c8a63be1 100644
--- a/phpseclib/Crypt/EC/Formats/Keys/Common.php
+++ b/phpseclib/Crypt/EC/Formats/Keys/Common.php
@@ -449,7 +449,7 @@ trait Common
              *   - neither the curve or the base point are generated verifiably randomly.
              * ecdpVer2:
              *   - curve and base point are generated verifiably at random and curve.seed is present
-             * ecdpVer3: 
+             * ecdpVer3:
              *   - base point is generated verifiably at random but curve is not. curve.seed is present
              */
             // other (optional) parameters can be calculated using the methods discused at
@@ -552,4 +552,4 @@ trait Common
     {
         self::$useNamedCurves = true;
     }
-}
\ No newline at end of file
+}
diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index fdd12a21..304b8386 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -670,10 +670,11 @@ class X509
      */
     private function mapOutExtensions(&$root, $path)
     {
-        foreach ($this->extensionValues as $id => $value) {
+        foreach ($this->extensionValues as $id => [$critical, $value]) {
             $root['tbsCertificate']['extensions'][] = [
                 'extnId' => $id,
                 'extnValue' => $value,
+                'critical' => $critical,
             ];
         }
 
@@ -4079,9 +4080,10 @@ class X509
      *
      * @param string $id
      * @param mixed $value
+     * @param bool $critical
      */
-    public function setExtensionValue($id, $value)
+    public function setExtensionValue($id, $value, $critical = false)
     {
-        $this->extensionValues[$id] = $value;
+        $this->extensionValues[$id] = [$critical, $value];
     }
 }