diff --git a/src/Eth.php b/src/Eth.php
index 16d8c98..23bbb7a 100644
--- a/src/Eth.php
+++ b/src/Eth.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3;
 
 use Web3\Providers\Provider;
diff --git a/src/Providers/HttpProvider.php b/src/Providers/HttpProvider.php
index 9ff1881..cdb2a4c 100644
--- a/src/Providers/HttpProvider.php
+++ b/src/Providers/HttpProvider.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Providers;
 
 use Web3\Providers\Provider;
diff --git a/src/Providers/IProvider.php b/src/Providers/IProvider.php
index a5f19ed..2ad7287 100644
--- a/src/Providers/IProvider.php
+++ b/src/Providers/IProvider.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Providers;
 
 interface IProvider
diff --git a/src/Providers/Provider.php b/src/Providers/Provider.php
index dade9b3..8414a45 100644
--- a/src/Providers/Provider.php
+++ b/src/Providers/Provider.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Providers;
 
 use Web3\RequestManagers\RequestManager;
diff --git a/src/RequestManagers/HttpRequestManager.php b/src/RequestManagers/HttpRequestManager.php
index 41fcae5..73929e8 100644
--- a/src/RequestManagers/HttpRequestManager.php
+++ b/src/RequestManagers/HttpRequestManager.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\RequestManagers;
 
 use Psr\Http\Message\ResponseInterface;
diff --git a/src/RequestManagers/IRequestManager.php b/src/RequestManagers/IRequestManager.php
index 1164bc2..f69e520 100644
--- a/src/RequestManagers/IRequestManager.php
+++ b/src/RequestManagers/IRequestManager.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\RequestManagers;
 
 interface IRequestManager
diff --git a/src/RequestManagers/RequestManager.php b/src/RequestManagers/RequestManager.php
index c7d4e90..a87bd1e 100644
--- a/src/RequestManagers/RequestManager.php
+++ b/src/RequestManagers/RequestManager.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\RequestManagers;
 
 class RequestManager
diff --git a/src/Validators/AddressValidator.php b/src/Validators/AddressValidator.php
index 22ec3e5..2d1664d 100644
--- a/src/Validators/AddressValidator.php
+++ b/src/Validators/AddressValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/BlockHashValidator.php b/src/Validators/BlockHashValidator.php
index 04cd7c2..37e31e9 100644
--- a/src/Validators/BlockHashValidator.php
+++ b/src/Validators/BlockHashValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/BooleanValidator.php b/src/Validators/BooleanValidator.php
index b2f3146..fd5909b 100644
--- a/src/Validators/BooleanValidator.php
+++ b/src/Validators/BooleanValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/FilterValidator.php b/src/Validators/FilterValidator.php
index 285adc4..8110710 100644
--- a/src/Validators/FilterValidator.php
+++ b/src/Validators/FilterValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/HexValidator.php b/src/Validators/HexValidator.php
index 21e13f7..28bbc61 100644
--- a/src/Validators/HexValidator.php
+++ b/src/Validators/HexValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/IValidators.php b/src/Validators/IValidators.php
index c92dc7d..d2bc71a 100644
--- a/src/Validators/IValidators.php
+++ b/src/Validators/IValidators.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 interface IValidators
diff --git a/src/Validators/NonceValidator.php b/src/Validators/NonceValidator.php
index 30b0125..849d472 100644
--- a/src/Validators/NonceValidator.php
+++ b/src/Validators/NonceValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/QuantityValidator.php b/src/Validators/QuantityValidator.php
index 672b738..f360a5e 100644
--- a/src/Validators/QuantityValidator.php
+++ b/src/Validators/QuantityValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/StringValidator.php b/src/Validators/StringValidator.php
index 677017a..c743145 100644
--- a/src/Validators/StringValidator.php
+++ b/src/Validators/StringValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/TagValidator.php b/src/Validators/TagValidator.php
index ab436d5..b4e00bc 100644
--- a/src/Validators/TagValidator.php
+++ b/src/Validators/TagValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Validators/TransactionValidator.php b/src/Validators/TransactionValidator.php
index da22651..f0c3d4a 100644
--- a/src/Validators/TransactionValidator.php
+++ b/src/Validators/TransactionValidator.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3\Validators;
 
 use Web3\Validators\IValidator;
diff --git a/src/Web3.php b/src/Web3.php
index f185ce2..7cdf4a8 100644
--- a/src/Web3.php
+++ b/src/Web3.php
@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * This file is part of web3.php package.
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
 namespace Web3;
 
 use Web3\Eth;