diff --git a/doc/configuration/Modules.md b/doc/configuration/Modules.md
index 1b8ab7efdeb..a6ac1bffdcf 100644
--- a/doc/configuration/Modules.md
+++ b/doc/configuration/Modules.md
@@ -99,6 +99,9 @@ This applies to situations such as sending messages or presences to mobile/SMS/e
 Implements [XEP-0215: External Service Discovery](http://xmpp.org/extensions/xep-0215.html) for discovering information about services external to the XMPP network.
 The main use-case is to help discover STUN/TURN servers to allow for negotiating media exchanges.
 
+### [mod_fast_auth_token](../modules/mod_fast_auth_token.md)
+A module that implements [XEP-0484: Fast Authentication Streamlining Tokens](https://xmpp.org/extensions/xep-0484.html)..
+
 ### [mod_http_upload](../modules/mod_http_upload.md)
 Implements [XEP-0363: HTTP File Upload](https://xmpp.org/extensions/xep-0363.html) for coordinating with an XMPP server to upload files via HTTP and receive URLs that can be shared in messages.
 
diff --git a/doc/modules/mod_fast_auth_token.md b/doc/modules/mod_fast_auth_token.md
new file mode 100644
index 00000000000..03f8959861c
--- /dev/null
+++ b/doc/modules/mod_fast_auth_token.md
@@ -0,0 +1,39 @@
+## Module Description
+
+This module implements [XEP-0484: Fast Authentication Streamlining Tokens](https://xmpp.org/extensions/xep-0484.html).
+It provides services necessary to:
+
+* issue auth tokens for authenticated users;
+* reconnect to the server using the tokens instead of the original auth method.
+
+Tokens are stored in RDBMS.
+
+It is not related to another similar module `mod_auth_token`.
+
+## Options
+
+### `modules.mod_fast_auth_token.backend`
+* **Syntax:** non-empty string
+* **Default:** `"rdbms"`
+* **Example:** `backend = "rdbms"`
+
+Token storage backend. Currently only `"rdbms"` is supported.
+
+### `modules.mod_fast_auth_token.validity_period`
+* **Syntax:** TOML table. Each key is either `access` or `rotate_before_expire`.Each value is a nested TOML table with the following mandatory keys: `value` (non-negative integer) and `unit` (`"days"`, `"hours"`, `"minutes"` or `"seconds"`).
+* **Default:** `{access = {value = 3, unit = "days"}, rotate_before_expire = {value = 6, unit = "hours"}}`
+* **Example:** `validity_period.access = {value = 30, unit = "minutes"}`
+
+The user can use each token for `access` period of time before it expired.
+
+The server would [send](https://xmpp.org/extensions/xep-0484.html#token-rotation)
+a new token at the login time `rotate_before_expire` time before it expires.
+Set it to 0 to disable automatic rotation.
+
+## Example configuration
+
+```toml
+[modules.mod_fast_auth_token]
+  validity_period.access = {value = 1, unit = "days"}
+  validity_period.rotate_before_expire = {value = 0, unit = "days"}
+```
diff --git a/mkdocs.yml b/mkdocs.yml
index 2b5b7d7f44e..c125abf834b 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -133,6 +133,7 @@ nav:
           - 'RabbitMQ backend': 'modules/mod_event_pusher_rabbit.md'
           - 'SNS backend': 'modules/mod_event_pusher_sns.md'
       - 'mod_extdisco': 'modules/mod_extdisco.md'
+      - 'mod_fast_auth_token': 'modules/mod_fast_auth_token.md'
       - 'mod_global_distrib': 'modules/mod_global_distrib.md'
       - 'mod_http_upload': 'modules/mod_http_upload.md'
       - 'mod_inbox': 'modules/mod_inbox.md'