diff --git a/README.md b/README.md
index cd1ce8d..04ecbe5 100644
--- a/README.md
+++ b/README.md
@@ -266,6 +266,13 @@ This wrapper cover the following APIs for now:
 | SYNO.ActiveBackup.Version                       | 
 | SYNO.ActiveBackup.Log                           |
 
+| Core User                     |
+|-------------------------------|
+| SYNO.Core.User                |
+| SYNO.Core.User.Group          |
+| SYNO.Core.User.PasswordPolicy |
+| SYNO.Core.User.PasswordExpiry |
+
 | Snapshot Replication     |
 |--------------------------|
 | SYNO.Core.Share.Snapshot |
@@ -342,7 +349,6 @@ This wrapper cover the following APIs for now:
 | SYNO.SurveillanceStation.Face.Result                      |
 | SYNO.SurveillanceStation.Recording.Bookmark               |
 
-
 #### FileStation Functions list
 
 To explain the use of some function I will divide all the functions in two sets
@@ -423,6 +429,7 @@ if you encounter problems you might set ```download_st_version = 2``` during ini
 | `resume_task()`         | Resume a task.                            |
 | `edit_task()`           | Edit a Task.                              |
 
+
 #### Photo functions:
 | Function                            |
 |-------------------------------------|
@@ -563,6 +570,9 @@ DS info with below functions:
 | `get_disk_utilization()`          |
 | `get_memory_utilization()`        |
 | `dsm_info()`                      |
+| `get_system_health()`                      |
+| `upgrade_status()`                      |
+| `groups_info()`                      |
 
 ### core_group (DSM User Groups)
 | Functions                  | Description                                                     |
@@ -581,6 +591,20 @@ DS info with below functions:
 | `create()`                 | Create new group                                                |
 | `delete()`                 | Delete specified groups                                         |
 
+### core_user (DSM User Settings)
+| Functions                  | Description                                                     |
+|----------------------------|-----------------------------------------------------------------|
+| `get_users()`             | Retrieve groups information                                                  |
+| `create_user()`              | Create a new user                                               |
+| `modify_user()`        | Modify a user                                    |
+| `delete_user()`              | Delete a user                                         |
+| `affect_groups()`       | Affect or disaffect groups to a user                                 |
+| `affect_groups_status()`         | Get the status of a join task                                     |
+| `get_password_policy()`  | Get the password policy                                     |
+| `set_password_policy()`        | Set the password policy                                         |
+| `get_password_expiry()`        | Get the password expiry                                   |
+| `set_password_expiry()`              | Set the password expiry                                            |
+
 ### Virtualization
 | Functions                  |
 |----------------------------|
diff --git a/synology_api/__init__.py b/synology_api/__init__.py
index 3f3b08b..f402c30 100755
--- a/synology_api/__init__.py
+++ b/synology_api/__init__.py
@@ -10,6 +10,7 @@
     core_backup, \
     core_certificate, \
     core_sys_info, \
+    core_group, \
     downloadstation, \
     log_center, \
     vpn, \
diff --git a/synology_api/core_sys_info.py b/synology_api/core_sys_info.py
index d447eab..d6d584c 100644
--- a/synology_api/core_sys_info.py
+++ b/synology_api/core_sys_info.py
@@ -1,6 +1,9 @@
 from __future__ import annotations
 from typing import Optional
 from . import base_api
+from __future__ import annotations
+from typing import Optional
+from . import base_api
 
 
 class SysInfo(base_api.BaseApi):
@@ -851,6 +854,22 @@ def server_pair(self) -> dict[str, object] | str:
 
         return self.request_data(api_name, api_path, req_param)
 
+    def groups_info(self, offset: int = 0, limit: int = -1, name_only: bool = False) -> dict[str, object] | str:
+        api_name = 'SYNO.Core.Group'
+        info = self.core_list[api_name]
+        api_path = info['path']
+
+        if name_only:
+            name_only = 'true'
+        elif not name_only:
+            name_only = 'false'
+        else:
+            return 'name_only must be True or False'
+        req_param = {'version': info['maxVersion'], 'method': 'list', 'offset': offset, 'limit': limit,
+                     'name_only': name_only, 'type': 'local'}
+
+        return self.request_data(api_name, api_path, req_param)
+
     def ldap_info(self) -> dict[str, object] | str:
         api_name = 'SYNO.Core.Directory.LDAP'
         info = self.core_list[api_name]
@@ -1020,3 +1039,17 @@ def active_notifications(self) -> dict[str, object] | str:
         req_param = {'version': info['maxVersion'], 'method': 'notify', 'action': 'load'}
 
         return self.request_data(api_name, api_path, req_param)
+
+    def get_system_health(self) -> dict[str, object] | str:
+        api_name = 'SYNO.Core.System.SystemHealth'
+        info = self.core_list[api_name]
+        api_path = info['path']
+        req_param = {'version': info['maxVersion'], 'method': 'get'}
+        return self.request_data(api_name, api_path, req_param)
+
+    def upgrade_status(self) -> dict[str, object] | str:
+        api_name = 'SYNO.Core.Upgrade'
+        info = self.core_list[api_name]
+        api_path = info['path']
+        req_param = {'version': info['maxVersion'], 'method': 'status'}
+        return self.request_data(api_name, api_path, req_param)