diff --git a/PRODUCT.md b/PRODUCT.md
index a7c4df7..edcabed 100644
--- a/PRODUCT.md
+++ b/PRODUCT.md
@@ -17,7 +17,7 @@
                 height
                     value
                     unit
-                lenght
+                length
                     value
                     unit
                 width
diff --git a/README.md b/README.md
index 6652f20..39df8df 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ Features
 * Get browse nodes information.
 * Get multiple results at once without the 10 items limitation from Amazon.
 * Configurable throttling to avoid requests exceptions.
+* Built-in serializer for Django REST framework.
 * Support for [all available countries](https://github.com/sergioteula/python-amazon-paapi/blob/master/amazon/paapi.py#L31).
 * Reorganized product information [structure](https://github.com/sergioteula/python-amazon-paapi/blob/master/PRODUCT.md) for simple use.
 * Ask for new features through the [issues](https://github.com/sergioteula/python-amazon-paapi/issues) section.
@@ -30,6 +31,10 @@ You can install or upgrade the module with:
 
     pip install python-amazon-paapi --upgrade
 
+If you get `ModuleNotFoundError`, try installing this:
+
+    pip install amightygirl.paapi5-python-sdk
+
 Usage guide
 -----------
 **Basic usage:**
@@ -75,34 +80,32 @@ Throttling value must be `greater than 0` or `False` to disable it. This value t
     amazon = AmazonAPI(KEY, SECRET, TAG, COUNTRY, throttling=0.5)  # Max one request every two seconds
     amazon = AmazonAPI(KEY, SECRET, TAG, COUNTRY, throttling=False)  # Unlimited requests per second
 
-**API support**
-We provide a serializer for django rest framework, which speeds up your api
+**Serializer for Django:**
+
+We provide a serializer for Django REST framework, which speeds up your API
 implementation.
 
-    from amazon.paapi import AmazonAPI
     from amazon.serializers import AmazonProductSerializer
     from rest_framework import serializers
-    amazon = AmazonAPI(KEY, SECRET, TAG, COUNTRY)
 
-    product = amazon.get_product('B01N5IB20Q')
     serialized_product = AmazonProductSerializer(product)
-    serialized.data  # this prints serialized product
+    serialized_product.data
 
-if you like to serialize a list of products:
+If you want to serialize a list of products:
 
-    products = amazon.search_products(item_count=40, keywords='Harry')
     serialized_products = AmazonProductSerializer(products, many=True)
     serialized_products.data
 
-For more Information how to work with serializers see the documentation of
-[django rest framework](https://www.django-rest-framework.org/api-guide/serializers/)
+For more information on how to work with serializers, check the documentation for
+[Django REST framework](https://www.django-rest-framework.org/api-guide/serializers/).
 
 
 Changelog
 -------------
-    Version 3.2.1 (unreleased)
-        - Added serializer class for django rest framework
-        - Added serialized data for your convenience
+    Version 3.3.0
+        - Added serializer class for Django REST framework.
+        - Solved bugs and typos.
+
     Version 3.2.0
         - Added new method for getting browse nodes information.
         - Removed the 10 pages limit on search_products and get_variations methods.
diff --git a/amazon/paapi.py b/amazon/paapi.py
index f7f06ea..dc5da06 100644
--- a/amazon/paapi.py
+++ b/amazon/paapi.py
@@ -164,8 +164,12 @@ def get_product(self, product_id: str, condition='Any', merchant='All',
             if len(check_product_id) > 1:
                 raise AmazonException('ValueError', 'Only 1 product ID is allowed, use '
                                                     'get_products for multiple requests')
-        return self.get_products(product_id, condition=condition, merchant=merchant,
-                                 async_req=async_req)[0]
+        product = self.get_products(product_id, condition=condition, merchant=merchant,
+                                    async_req=async_req)
+        if product:
+            return product[0]
+        else:
+            return None
 
     def search_products(self, item_count=10, item_page=1, items_per_page=10, keywords=None,
                         actor=None, artist=None, author=None, brand=None, title=None,
diff --git a/amazon/parse.py b/amazon/parse.py
index 246c507..766b093 100644
--- a/amazon/parse.py
+++ b/amazon/parse.py
@@ -225,15 +225,15 @@ def parse_product(item):
         product.product.dimensions.height.unit = item.item_info.product_info.item_dimensions.height.unit
     except Exception:
         product.product.dimensions.height.unit = None
-    product.product.dimensions.lenght = Class()
+    product.product.dimensions.length = Class()
     try:
-        product.product.dimensions.lenght.value = item.item_info.product_info.item_dimensions.lenght.display_value
+        product.product.dimensions.length.value = item.item_info.product_info.item_dimensions.length.display_value
     except Exception:
-        product.product.dimensions.lenght.value = None
+        product.product.dimensions.length.value = None
     try:
-        product.product.dimensions.lenght.unit = item.item_info.product_info.item_dimensions.lenght.unit
+        product.product.dimensions.length.unit = item.item_info.product_info.item_dimensions.length.unit
     except Exception:
-        product.product.dimensions.lenght.unit = None
+        product.product.dimensions.length.unit = None
     product.product.dimensions.width = Class()
     try:
         product.product.dimensions.width.value = item.item_info.product_info.item_dimensions.width.display_value
diff --git a/setup.py b/setup.py
index 51e5e88..403568b 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name='python-amazon-paapi',
-    version='3.2.0',
+    version='3.3.0',
     author='Sergio Abad',
     author_email='sergio.abad@bytelix.com',
     description='Amazon Product Advertising API 5.0 wrapper for Python',