diff --git a/app/code/Magento/Customer/Model/Address.php b/app/code/Magento/Customer/Model/Address.php
index e9aa2839095d5..ea9b103f42273 100644
--- a/app/code/Magento/Customer/Model/Address.php
+++ b/app/code/Magento/Customer/Model/Address.php
@@ -122,7 +122,7 @@ public function __construct(
     }
 
     /**
-     * Init model
+     * Initialize address model
      *
      * @return void
      */
@@ -167,7 +167,14 @@ public function updateData(AddressInterface $address)
     }
 
     /**
-     * @inheritdoc
+     * Create address data object based on current address model.
+     *
+     * @param int|null $defaultBillingAddressId
+     * @param int|null $defaultShippingAddressId
+     * @return AddressInterface
+     * Use Api/Data/AddressInterface as a result of service operations. Don't rely on the model to provide
+     * the instance of Api/Data/AddressInterface
+     * @SuppressWarnings(PHPMD.CyclomaticComplexity)
      */
     public function getDataModel($defaultBillingAddressId = null, $defaultShippingAddressId = null)
     {
@@ -257,7 +264,7 @@ public function getDefaultAttributeCodes()
     }
 
     /**
-     * Clone object handler
+     * Clone address
      *
      * @return void
      */
@@ -356,7 +363,11 @@ public function reindex()
     }
 
     /**
-     * @inheritdoc
+     * Get a list of custom attribute codes.
+     *
+     * By default, entity can be extended only using extension attributes functionality.
+     *
+     * @return string[]
      * @since 100.0.6
      */
     protected function getCustomAttributesCodes()
diff --git a/app/code/Magento/Customer/Model/Customer.php b/app/code/Magento/Customer/Model/Customer.php
index b00f393f53734..e970e3695d4a2 100644
--- a/app/code/Magento/Customer/Model/Customer.php
+++ b/app/code/Magento/Customer/Model/Customer.php
@@ -1305,7 +1305,7 @@ public function getResetPasswordLinkExpirationPeriod()
     }
 
     /**
-     * Create address instance
+     * Create Address from Factory
      *
      * @return Address
      */
@@ -1315,7 +1315,7 @@ protected function _createAddressInstance()
     }
 
     /**
-     * Create address collection instance
+     * Create Address Collection from Factory
      *
      * @return \Magento\Customer\Model\ResourceModel\Address\Collection
      */
@@ -1325,7 +1325,7 @@ protected function _createAddressCollection()
     }
 
     /**
-     * Returns templates types
+     * Get Template Types
      *
      * @return array
      */
diff --git a/app/code/Magento/Customer/Model/ResourceModel/CustomerRepository.php b/app/code/Magento/Customer/Model/ResourceModel/CustomerRepository.php
index b25838e245488..ddc0576cb0dae 100644
--- a/app/code/Magento/Customer/Model/ResourceModel/CustomerRepository.php
+++ b/app/code/Magento/Customer/Model/ResourceModel/CustomerRepository.php
@@ -171,7 +171,14 @@ public function __construct(
     }
 
     /**
-     * @inheritdoc
+     * Create or update a customer.
+     *
+     * @param \Magento\Customer\Api\Data\CustomerInterface $customer
+     * @param string $passwordHash
+     * @return \Magento\Customer\Api\Data\CustomerInterface
+     * @throws \Magento\Framework\Exception\InputException If bad input is provided
+     * @throws \Magento\Framework\Exception\State\InputMismatchException If the provided email is already used
+     * @throws \Magento\Framework\Exception\LocalizedException
      * @SuppressWarnings(PHPMD.CyclomaticComplexity)
      * @SuppressWarnings(PHPMD.NPathComplexity)
      */
@@ -304,7 +311,13 @@ private function populateCustomerWithSecureData($customerModel, $passwordHash =
     }
 
     /**
-     * @inheritdoc
+     * Retrieve customer.
+     *
+     * @param string $email
+     * @param int|null $websiteId
+     * @return \Magento\Customer\Api\Data\CustomerInterface
+     * @throws \Magento\Framework\Exception\NoSuchEntityException If customer with the specified email does not exist.
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function get($email, $websiteId = null)
     {
@@ -313,7 +326,12 @@ public function get($email, $websiteId = null)
     }
 
     /**
-     * @inheritdoc
+     * Get customer by Customer ID.
+     *
+     * @param int $customerId
+     * @return \Magento\Customer\Api\Data\CustomerInterface
+     * @throws \Magento\Framework\Exception\NoSuchEntityException If customer with the specified ID does not exist.
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function getById($customerId)
     {
@@ -322,7 +340,15 @@ public function getById($customerId)
     }
 
     /**
-     * @inheritdoc
+     * Retrieve customers which match a specified criteria.
+     *
+     * This call returns an array of objects, but detailed information about each object’s attributes might not be
+     * included. See http://devdocs.magento.com/codelinks/attributes.html#CustomerRepositoryInterface to determine
+     * which call to use to get detailed information about all attributes for an object.
+     *
+     * @param \Magento\Framework\Api\SearchCriteriaInterface $searchCriteria
+     * @return \Magento\Customer\Api\Data\CustomerSearchResultsInterface
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function getList(SearchCriteriaInterface $searchCriteria)
     {
@@ -362,7 +388,11 @@ public function getList(SearchCriteriaInterface $searchCriteria)
     }
 
     /**
-     * @inheritdoc
+     * Delete customer.
+     *
+     * @param \Magento\Customer\Api\Data\CustomerInterface $customer
+     * @return bool true on success
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function delete(CustomerInterface $customer)
     {
@@ -370,7 +400,12 @@ public function delete(CustomerInterface $customer)
     }
 
     /**
-     * @inheritdoc
+     * Delete customer by Customer ID.
+     *
+     * @param int $customerId
+     * @return bool true on success
+     * @throws \Magento\Framework\Exception\NoSuchEntityException
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function deleteById($customerId)
     {