diff --git a/crowdin_api/api_resources/string_translations/resource.py b/crowdin_api/api_resources/string_translations/resource.py
index 0a31dc5..ffefc97 100644
--- a/crowdin_api/api_resources/string_translations/resource.py
+++ b/crowdin_api/api_resources/string_translations/resource.py
@@ -249,6 +249,7 @@ def add_translation(
         text: str,
         projectId: Optional[int] = None,
         pluralCategoryName: Optional[PluralCategoryName] = None,
+        addToTm: Optional[bool] = None,
     ):
         """
         Add Translation.
@@ -256,7 +257,6 @@ def add_translation(
         Link to documentation:
         https://developer.crowdin.com/api/v2/#operation/api.projects.translations.post
         """
-
         projectId = projectId or self.get_project_id()
 
         return self.requester.request(
@@ -267,6 +267,7 @@ def add_translation(
                 "languageId": languageId,
                 "text": text,
                 "pluralCategoryName": pluralCategoryName,
+                "addToTm": addToTm,
             },
         )
 
diff --git a/crowdin_api/api_resources/string_translations/tests/test_string_translations_resources.py b/crowdin_api/api_resources/string_translations/tests/test_string_translations_resources.py
index 35872b2..90cbdec 100644
--- a/crowdin_api/api_resources/string_translations/tests/test_string_translations_resources.py
+++ b/crowdin_api/api_resources/string_translations/tests/test_string_translations_resources.py
@@ -339,6 +339,7 @@ def test_list_string_translations(self, m_request, in_params, request_params, ba
                     "languageId": "ua",
                     "text": "text",
                     "pluralCategoryName": None,
+                    "addToTm": None,
                 },
             ),
             (
@@ -353,6 +354,7 @@ def test_list_string_translations(self, m_request, in_params, request_params, ba
                     "languageId": "ua",
                     "text": "text",
                     "pluralCategoryName": "some name",
+                    "addToTm": None,
                 },
             ),
         ),
@@ -362,7 +364,7 @@ def test_add_translation(self, m_request, in_params, request_data, base_absolut_
         m_request.return_value = "response"
 
         resource = self.get_resource(base_absolut_url)
-        assert resource.add_translation(projectId=1, **request_data) == "response"
+        assert resource.add_translation(projectId=1, **in_params) == "response"
         m_request.assert_called_once_with(
             method="post",
             path=resource.get_translations_path(projectId=1),