diff --git a/appstoreconnect/api.py b/appstoreconnect/api.py
index d0416c5..a23f256 100644
--- a/appstoreconnect/api.py
+++ b/appstoreconnect/api.py
@@ -496,6 +496,13 @@ def create_beta_app_localization(self, app: App, locale: str, description: str =
 		"""
 		return self._create_resource(BetaAppLocalization, locals())
 
+	def modify_a_beta_app_localization(self, betaAppLocalization: BetaAppLocalization, description: str = None, feedbackEmail: str = None, marketingUrl: str = None, privacyPolicyUrl: str = None, tvOsPrivacyPolicy: str = None):
+		"""
+		:reference: https://developer.apple.com/documentation/appstoreconnectapi/modify_a_beta_app_localization
+		:return: an BetaAppLocalization resource
+		"""
+		return self._modify_resource(betaAppLocalization, locals())
+
 	def list_app_encryption_declarations(self, filters=None):
 		"""
 		:reference: https://developer.apple.com/documentation/appstoreconnectapi/list_app_encryption_declarations
@@ -692,6 +699,14 @@ def read_beta_app_review_submission_information(self, beta_app_id: str):
 		"""
 		return self._get_resource(BetaAppReviewSubmission, beta_app_id)
 
+	def modify_a_beta_app_review_detail(self, beta_app_review_detail: BetaAppReviewDetail, demoAccountName: str, demoAccountPassword: str, demoAccountRequired: bool, contactFirstName: str, contactLastName: str, contactEmail: str, contactPhone: str, notes: str = None) -> AppStoreReviewDetail:
+		"""
+		:reference: https://developer.apple.com/documentation/appstoreconnectapi/modify_a_beta_app_review_detail
+		:return: an BetaAppReviewDetail resource
+		"""
+		attributes = {'demoAccountName':demoAccountName, 'demoAccountPassword':demoAccountPassword, 'demoAccountRequired':demoAccountRequired, 'contactFirstName':contactFirstName, 'contactLastName':contactLastName, 'contactEmail': contactEmail, 'contactPhone':contactPhone, 'notes': notes}
+		return self._modify_resource(beta_app_review_detail, attributes)
+
 	def create_an_app_store_version_submission(self, appStoreVersion: AppStoreVersion):
 		"""
 		:reference: https://developer.apple.com/documentation/appstoreconnectapi/create_an_app_store_version_submission
diff --git a/appstoreconnect/resources.py b/appstoreconnect/resources.py
index c4d1643..b440fe9 100644
--- a/appstoreconnect/resources.py
+++ b/appstoreconnect/resources.py
@@ -258,11 +258,28 @@ class Build(Resource):
 	endpoint = '/v1/builds'
 	type = 'builds'
 	attributes = ['expired', 'iconAssetToken', 'minOsVersion', 'processingState', 'version', 'usesNonExemptEncryption', 'uploadedDate', 'expirationDate']
+	relationships = {
+		'app': {'multiple': False},
+		'appEncryptionDeclaration': {'multiple': False},
+		'individualTesters': {'multiple': True},
+		'preReleaseVersion': {'multiple': False},
+		'betaBuildLocalizations': {'multiple': True},
+		'buildBetaDetail': {'multiple': False},
+		'betaAppReviewSubmission': {'multiple': False},
+		'appStoreVersion': {'multiple': False},
+		'icons': {'multiple': True},
+		'buildBundles': {'multiple': True},
+		'betaGroups': {'multiple': True},
+	}
 	documentation = 'https://developer.apple.com/documentation/appstoreconnectapi/build/attributes'
 
 
 class BuildBetaDetail(Resource):
 	endpoint = '/v1/buildBetaDetails'
+	attributes = ['autoNotifyEnabled', 'externalBuildState', 'internalBuildState']
+	relationships = {
+		'build': {'multiple': False},
+	}
 	type = 'buildBetaDetails'
 	documentation = 'https://developer.apple.com/documentation/appstoreconnectapi/buildBetaDetail/attributes'
 
@@ -280,6 +297,10 @@ class BetaBuildLocalization(Resource):
 class BetaAppReviewDetail(Resource):
 	endpoint = '/v1/betaAppReviewDetails'
 	type = 'betaAppReviewDetails'
+	attributes = ['contactEmail', 'contactFirstName', 'contactLastName', 'contactPhone', 'demoAccountName', 'demoAccountPassword', 'demoAccountRequired', 'notes']
+	relationships = {
+		'app': {'multiple': False},
+	}
 	documentation = 'https://developer.apple.com/documentation/appstoreconnectapi/betaAppReviewDetail/attributes'