diff --git a/README.md b/README.md
index 48eeca1..881abc9 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,34 @@ A pure PHP implementation of [xxhash](https://github.com/Cyan4973/xxHash)
 Currently only working for the 32 bit version.
 
 If speed is important use the php extension instead
+
+# Installing
+
+Ideally use composer 
+
+    composer require exussum12/xxhash
+
+Alternatively require the single file (making sure the path is correct)
+
+    require 'xxhash/V32.php';
+
+# Hashing input
+
+xxhash has a seed, this is 0 by default. To make a new instance of xxhash run
+
+    $seed = 0;
+    $hash = new V32($seed);
+
+Then to hash input, run
+
+    $hash->hash('string'); ## to hasha string
+    $file = fopen('path/to/file.ext', 'r');
+    $hash->hashStream($file); # for a stream (better for large files)
+
+The library can be called statically also, however this removes the ability to change the seed. The default see of 0 will be used
+
+    V32::hash('string'); ## to hasha string
+    $file = fopen('path/to/file.ext', 'r');
+    V32::hashStream($file); # for a stream (better for large files)
+
+Static functions should in general be avoided so the first method is the preferred method to use.
diff --git a/composer.json b/composer.json
index 2a2301a..804d665 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "library",
     "require": {
         "phpunit/phpunit": "^7.1",
-        "php": ">=7.0",
+        "php": ">=7.1",
         "ext-bcmath": "*"
     },
     "autoload": {
diff --git a/src/V32.php b/src/V32.php
index 3b16a1b..a77b86d 100644
--- a/src/V32.php
+++ b/src/V32.php
@@ -18,21 +18,31 @@ class V32
 
     public function __construct(int $seed = 0)
     {
-
         $this->seed = $seed;
     }
-    public function hash(string $input)
+
+    public function hash(string $input): string
     {
         $file = tmpfile();
         fwrite($file, $input);
         rewind($file);
 
+        if (!isset($this)) {
+            $hash = new self();
+            return $hash->hashStream($file);
+        }
+
         return $this->hashStream($file);
     }
 
-    public function hashStream($input)
+    public function hashStream($input): string
     {
-        if (get_resource_type($input) !== "stream") {
+        if (!isset ($this)) {
+            $hash = new self();
+            return $hash->hashStream($input);
+        }
+
+        if (get_resource_type($input) !== 'stream') {
             throw new InvalidArgumentException();
         }
 
@@ -70,10 +80,10 @@ public function hashStream($input)
         return $this->smallInput($part, $accumulator);
     }
 
-    private function smallInput($input, $accumulator)
+    private function smallInput($input, $accumulator): string
     {
 
-        list($accumulator, $i, $length) = $this->handle4ByteGroups($input, $accumulator);
+        [$accumulator, $i, $length] = $this->handle4ByteGroups($input, $accumulator);
 
         $accumulator = $this->handleLeftOverBytes($input, $accumulator, $length, $i);
 
@@ -128,7 +138,7 @@ public function minus($a, $b):int
     /**
      * left shift wrap at 32 bits
      */
-    public function leftShift($x, $bits)
+    public function leftShift($x, $bits): int
     {
         //left shift is a circular shift so shifted off bits become lower bits
         $circle = $x >> (32-$bits);
diff --git a/tests/HashTest.php b/tests/HashTest.php
index 7489377..5640005 100644
--- a/tests/HashTest.php
+++ b/tests/HashTest.php
@@ -6,6 +6,11 @@
 
 class HashTest extends TestCase
 {
+    /**
+     * @var V32
+     */
+    protected $hash;
+
     public function setUp()
     {
         $this->hash = new V32(0);
@@ -51,4 +56,11 @@ public function testDifferntSeed()
             $hash->hash('test')
         );
     }
+    public function testStaticCall()
+    {
+        $this->assertSame(
+            '3e2023cf',
+            V32::hash('test')
+        );
+    }
 }