diff --git a/src/Filesystem/FilesystemInterface.php b/src/Filesystem/FilesystemInterface.php
index a73df8ff..9b5c50fa 100644
--- a/src/Filesystem/FilesystemInterface.php
+++ b/src/Filesystem/FilesystemInterface.php
@@ -25,24 +25,19 @@ interface FilesystemInterface
      *
      * By default, if the target already exists, it is not overridden.
      *
-     * @param string $originFile The original filename
-     * @param string $targetFile The target filename
-     * @param bool   $override   Whether to override an existing file or not
-     *
      * @throws FileNotFoundException When originFile doesn't exist
      * @throws IOException           When copy fails
      */
-    public function copy($originFile, $targetFile, $override = false);
+    public function copy(string $originFile, string $targetFile, bool $override = false);
 
     /**
      * Creates a directory recursively.
      *
      * @param string|array|\Traversable $dirs The directory path
-     * @param int                       $mode The directory mode
      *
      * @throws IOException On any directory creation failure
      */
-    public function mkdir($dirs, $mode = 0777);
+    public function mkdir($dirs, int $mode = 0777);
 
     /**
      * Checks the existence of files or directories.
@@ -57,12 +52,10 @@ public function exists($files);
      * Sets access and modification time of file.
      *
      * @param string|array|\Traversable $files A filename, an array of files, or a \Traversable instance to create
-     * @param int                       $time  The touch time as a Unix timestamp
-     * @param int                       $atime The access time as a Unix timestamp
      *
      * @throws IOException When touch fails
      */
-    public function touch($files, $time = null, $atime = null);
+    public function touch($files, int $time = null, int $atime = null);
 
     /**
      * Removes files or directories.
@@ -77,64 +70,47 @@ public function remove($files);
      * Change mode for an array of files or directories.
      *
      * @param string|array|\Traversable $files     A filename, an array of files, or a \Traversable instance to change mode
-     * @param int                       $mode      The new mode (octal)
-     * @param int                       $umask     The mode mask (octal)
-     * @param bool                      $recursive Whether change the mod recursively or not
      *
      * @throws IOException When the change fail
      */
-    public function chmod($files, $mode, $umask = 0000, $recursive = false);
+    public function chmod($files, int $mode, int $umask = 0000, bool $recursive = false);
 
     /**
      * Change the owner of an array of files or directories.
      *
      * @param string|array|\Traversable $files     A filename, an array of files, or a \Traversable instance to change owner
-     * @param string                    $user      The new owner user name
-     * @param bool                      $recursive Whether change the owner recursively or not
      *
      * @throws IOException When the change fail
      */
-    public function chown($files, $user, $recursive = false);
+    public function chown($files, string $user, bool $recursive = false);
 
     /**
      * Change the group of an array of files or directories.
      *
      * @param string|array|\Traversable $files     A filename, an array of files, or a \Traversable instance to change group
-     * @param string                    $group     The group name
-     * @param bool                      $recursive Whether change the group recursively or not
      *
      * @throws IOException When the change fail
      */
-    public function chgrp($files, $group, $recursive = false);
+    public function chgrp($files, string $group, bool $recursive = false);
 
     /**
      * Renames a file or a directory.
      *
-     * @param string $origin    The origin filename or directory
-     * @param string $target    The new filename or directory
-     * @param bool   $overwrite Whether to overwrite the target if it already exists
-     *
      * @throws IOException When target file or directory already exists
      * @throws IOException When origin cannot be renamed
      */
-    public function rename($origin, $target, $overwrite = false);
+    public function rename(string $origin, string $target, bool $overwrite = false);
 
     /**
      * Creates a symbolic link or copy a directory.
      *
-     * @param string $originDir     The origin directory path
-     * @param string $targetDir     The symbolic link name
-     * @param bool   $copyOnWindows Whether to copy files if on Windows
-     *
      * @throws IOException When symlink fails
      */
-    public function symlink($originDir, $targetDir, $copyOnWindows = false);
+    public function symlink(string $originDir, string $targetDir, bool $copyOnWindows = false);
 
     /**
      * Mirrors a directory to another.
      *
-     * @param string       $originDir The origin directory
-     * @param string       $targetDir The target directory
      * @param \Traversable $iterator  A Traversable instance
      * @param array        $options   An array of boolean options
      *                                Valid options are:
@@ -144,26 +120,21 @@ public function symlink($originDir, $targetDir, $copyOnWindows = false);
      *
      * @throws IOException When file type is unknown
      */
-    public function mirror($originDir, $targetDir, \Traversable $iterator = null, $options = []);
+    public function mirror(string $originDir, string $targetDir, \Traversable $iterator = null, array $options = []);
 
     /**
      * Given an existing path, convert it to a path relative to a given starting path.
      *
-     * @param string $endPath   Absolute path of target
-     * @param string $startPath Absolute path where traversal begins
-     *
      * @return string Path of target relative to starting path
      */
-    public function makePathRelative($endPath, $startPath);
+    public function makePathRelative(string $endPath, string $startPath);
 
     /**
      * Returns whether the file path is an absolute path.
      *
-     * @param string $file A file path
-     *
      * @return bool
      */
-    public function isAbsolutePath($file);
+    public function isAbsolutePath(string $file);
 
     public function getFileContents(string $file): string;
 }