diff --git a/README.md b/README.md
index 95eb363610..2dad0a5493 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,7 @@ The final configuration file will be generated by merging the default configurat
 | DOCS             | Information for creating related document links. <br/> - Array of objects with labels and links <br/> - Support ejs template grammar <br/> - Provided variable: `lang` (User language code. e.g. "en") | X        |
 | CONTACT_LINK     | Define the 'contact us' link on the SignIn page                                                                                                                                                        | X        |
 | ADVANCED_SERVICE | The dict of advanced service names and allowed domain ids. { service_name: [id1, id2, ...] }                                                                                                           | X        |
+| SMTP_ENABLED | The state of the SMTP(Simple Mail Transfer Protocol) functionality. | X        |
 
 
 ### 3. Add your chart license keys to your config file (Optional)