diff --git a/config.js b/config.js
index a99e08923..6a1f999a7 100644
--- a/config.js
+++ b/config.js
@@ -212,6 +212,13 @@ const CONFIG = {
   RECAPTCHA_PUBLIC: process.env.TALK_RECAPTCHA_PUBLIC,
   RECAPTCHA_SECRET: process.env.TALK_RECAPTCHA_SECRET,
 
+  // RECAPTCHA_WINDOW is the rate limit's time interval
+  RECAPTCHA_WINDOW: process.env.TALK_RECAPTCHA_WINDOW || '10m',
+
+  // After RECAPTCHA_INCORRECT_TRIGGER incorrect attempts, recaptcha will be required.
+  RECAPTCHA_INCORRECT_TRIGGER:
+    process.env.TALK_RECAPTCHA_INCORRECT_TRIGGER || 5,
+
   // WEBSOCKET_LIVE_URI is the absolute url to the live endpoint.
   WEBSOCKET_LIVE_URI: process.env.TALK_WEBSOCKET_LIVE_URI || null,
 
diff --git a/docs/source/02-02-advanced-configuration.md b/docs/source/02-02-advanced-configuration.md
index b2ad29ad0..5b638401d 100644
--- a/docs/source/02-02-advanced-configuration.md
+++ b/docs/source/02-02-advanced-configuration.md
@@ -316,6 +316,18 @@ default to providing only a time based lockout. Refer to
 [reCAPTCHA](https://www.google.com/recaptcha/intro/index.html) for information
 on getting an account setup.
 
+## TALK_RECAPTCHA_WINDOW
+
+The rate limit time interval that there can be [TALK_RECAPTCHA_INCORRECT_TRIGGER](#talk_recaptcha_incorrect_trigger) incorrect attempts until the reCAPTCHA is
+marked as required, parsed by
+[ms](https://www.npmjs.com/package/ms). (Default `10m`)
+
+## TALK_RECAPTCHA_INCORRECT_TRIGGER
+
+The number of times that an incorrect login can be entered before within a time
+perioud indicated by [TALK_RECAPTCHA_WINDOW](#talk_recaptcha_window) until the
+reCAPTCHA is marked as required. (Default `5`)
+
 ## TALK_REDIS_CLIENT_CONFIGURATION
 
 Configuration overrides for the redis client configuration in a JSON encoded
@@ -531,4 +543,4 @@ Sets the logging level for the context logger (from [Bunyan](https://github.com/
 A JSON string representing the configuration passed to the
 [fetch](https://www.npmjs.com/package/node-fetch) call for the scraper. It
 can be used to set an authorization header, or change the user agent. (Default
-`{}`)
\ No newline at end of file
+`{}`)
diff --git a/services/users.js b/services/users.js
index e53df4119..1e84c8ff1 100644
--- a/services/users.js
+++ b/services/users.js
@@ -18,12 +18,14 @@ const {
   ErrCannotIgnoreStaff,
 } = require('../errors');
 const { difference, sample, some, merge, random } = require('lodash');
-const { ROOT_URL } = require('../config');
+const {
+  ROOT_URL,
+  RECAPTCHA_WINDOW,
+  RECAPTCHA_INCORRECT_TRIGGER,
+} = require('../config');
 const { jwt: JWT_SECRET } = require('../secrets');
 const debug = require('debug')('talk:services:users');
 const User = require('../models/user');
-const RECAPTCHA_WINDOW = '10m'; // 10 minutes.
-const RECAPTCHA_INCORRECT_TRIGGER = 5; // after 5 incorrect attempts, recaptcha will be required.
 const Actions = require('./actions');
 const mailer = require('./mailer');
 const i18n = require('./i18n');