diff --git a/twocaptcha/async_solver.py b/twocaptcha/async_solver.py
index 134be8b..8a58f8a 100644
--- a/twocaptcha/async_solver.py
+++ b/twocaptcha/async_solver.py
@@ -868,6 +868,11 @@ async def captchafox(self, sitekey, pageurl, userAgent, proxy, **kwargs):
             User-Agent of the browser that will be used by the employee when loading the captcha.
         proxy : dict
             {'type': 'HTTPS', 'uri': 'login:password@IP_address:PORT'}.
+        api_server : str, optional
+            Default: https://cdn.captchafox.com/. Depending on the parameter value, the token format
+            changes — it will be prefixed with MAM_. For this, you need to set the server URL to:
+            https://s.uicdn.com/mampkg/@mamdev/core.frontend.libs.captchafox/. Two different APIs
+            return two different tokens. Choose the one you need.
         '''
 
 
diff --git a/twocaptcha/solver.py b/twocaptcha/solver.py
index da25d11..2ff945b 100755
--- a/twocaptcha/solver.py
+++ b/twocaptcha/solver.py
@@ -998,6 +998,11 @@ def captchafox(self, sitekey, pageurl, userAgent, proxy, **kwargs):
             User-Agent of the browser that will be used by the employee when loading the captcha.
         proxy : dict
             {'type': 'HTTPS', 'uri': 'login:password@IP_address:PORT'}.
+        api_server : str, optional
+            Default: https://cdn.captchafox.com/. Depending on the parameter value, the token format
+            changes — it will be prefixed with MAM_. For this, you need to set the server URL to:
+            https://s.uicdn.com/mampkg/@mamdev/core.frontend.libs.captchafox/. Two different APIs
+            return two different tokens. Choose the one you need.
         '''