diff --git a/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php b/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
index 0dcd72673e1e2..18e9b5ac1b7f4 100644
--- a/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
+++ b/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
@@ -26,17 +26,40 @@
  */
 class FlattenException extends LegacyFlattenException
 {
+    /** @var string */
     private $message;
+
+    /** @var int|string */
     private $code;
+
+    /** @var self|null */
     private $previous;
+
+    /** @var array */
     private $trace;
+
+    /** @var string */
     private $traceAsString;
+
+    /** @var string */
     private $class;
+
+    /** @var int */
     private $statusCode;
+
+    /** @var string */
     private $statusText;
+
+    /** @var array */
     private $headers;
+
+    /** @var string */
     private $file;
+
+    /** @var int */
     private $line;
+
+    /** @var string|null */
     private $asString;
 
     public static function create(\Exception $exception, $statusCode = null, array $headers = []): self
@@ -104,6 +127,8 @@ public function getStatusCode(): int
     }
 
     /**
+     * @param int $code
+     *
      * @return $this
      */
     public function setStatusCode($code): self
@@ -134,6 +159,8 @@ public function getClass(): string
     }
 
     /**
+     * @param string $class
+     *
      * @return $this
      */
     public function setClass($class): self
@@ -149,6 +176,8 @@ public function getFile(): string
     }
 
     /**
+     * @param string $file
+     *
      * @return $this
      */
     public function setFile($file): self
@@ -164,6 +193,8 @@ public function getLine(): int
     }
 
     /**
+     * @param int $line
+     *
      * @return $this
      */
     public function setLine($line): self
@@ -191,6 +222,8 @@ public function getMessage(): string
     }
 
     /**
+     * @param string $message
+     *
      * @return $this
      */
     public function setMessage($message): self
@@ -215,6 +248,8 @@ public function getCode()
     }
 
     /**
+     * @param int|string $code
+     *
      * @return $this
      */
     public function setCode($code): self
@@ -282,6 +317,10 @@ public function setTraceFromThrowable(\Throwable $throwable): self
     }
 
     /**
+     * @param array       $trace
+     * @param string|null $file
+     * @param int|null    $line
+     *
      * @return $this
      */
     public function setTrace($trace, $file, $line): self