diff --git a/erpnext/docs/assets/img/setup/users/user-login-email.png b/erpnext/docs/assets/img/setup/users/user-login-email.png
new file mode 100644
index 0000000..71050af
--- /dev/null
+++ b/erpnext/docs/assets/img/setup/users/user-login-email.png
Binary files differ
diff --git a/erpnext/docs/assets/img/setup/users/user-login-mobile.png b/erpnext/docs/assets/img/setup/users/user-login-mobile.png
new file mode 100644
index 0000000..1d7af14
--- /dev/null
+++ b/erpnext/docs/assets/img/setup/users/user-login-mobile.png
Binary files differ
diff --git a/erpnext/docs/user/manual/en/setting-up/settings/system-settings.md b/erpnext/docs/user/manual/en/setting-up/settings/system-settings.md
index 053b4f1..b436b46 100644
--- a/erpnext/docs/user/manual/en/setting-up/settings/system-settings.md
+++ b/erpnext/docs/user/manual/en/setting-up/settings/system-settings.md
@@ -2,6 +2,8 @@
 
 You can localize ERPNext to use particular timezone, date, number or currency format and also set global session expiry via System Settings.
 
+By checking the 'Allow Login using Mobile Number' checkbox, you can login to ERPNext using a valid mobile number set in your User account. 
+
 To open System Settings, go to:
 
 > Setup > Settings > System Settings
diff --git a/erpnext/docs/user/manual/en/setting-up/users-and-permissions/adding-users.md b/erpnext/docs/user/manual/en/setting-up/users-and-permissions/adding-users.md
index 517c674..6fb64df 100644
--- a/erpnext/docs/user/manual/en/setting-up/users-and-permissions/adding-users.md
+++ b/erpnext/docs/user/manual/en/setting-up/users-and-permissions/adding-users.md
@@ -20,7 +20,10 @@
 
 Add user details such as First Name, Last Name, Email etc.
 
-The user's Email will become the user id.
+The user's Email will become the user id. Mobile No can also be used to log in if you check the Allow Login using Mobile No checkbox under the Security section in System Settings. While Mobile No will be unique, it will not be treated as a user id.
+
+<img class="screenshot" src="{{docs_base_url}}/assets/img/setup/users/user-login-email.png" alt="Email Login">
+<img class="screenshot" src="{{docs_base_url}}/assets/img/setup/users/user-login-mobile.png" alt="Mobile No Login">
 
 After adding these details, save the user.