diff --git a/README.md b/README.md
index 82f78eb..ba4cc3c 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ The spec is currently at version 2.2.0.
 
 The documentation is currently generated by Sphinx. It can be generated locally with:
 
-    docker run --rm -v $PWD:/opt -w /opt -e USER_ID=$UID ddidier/sphinx-doc:2.2.1-1 sphinx-build -b html source build
+    docker run --rm -v $PWD:/opt -w /opt -e USER_ID=$UID ddidier/sphinx-doc:4.1.2-2 sphinx-build -b html source build
 
 The generated documentation is then rooted in `build/index.html`.
 
diff --git a/live.py b/live.py
index 818ff4a..c043f13 100755
--- a/live.py
+++ b/live.py
@@ -2,5 +2,5 @@
 
 from livereload import Server, shell
 server = Server()
-server.watch('build/html/*.html')
-server.serve(root="build/html", open_url_delay=4)
+server.watch('build/*.html')
+server.serve(root="build", open_url_delay=4)
diff --git a/source/decoupled_authentication.rst b/source/decoupled_authentication.rst
new file mode 100644
index 0000000..ee618ae
--- /dev/null
+++ b/source/decoupled_authentication.rst
@@ -0,0 +1,125 @@
+.. _3ds_decoupled_authentication:
+
+Decoupled Authentication
+=========================
+
+There are four different authentication flows in the 3-D Secure protocol. The decoupled authentication
+flow is one of them. The decoupled authentication flow is an asynchronous process.
+
+The ACS can determine decoupled authentication fallback for an authentication transaction.
+If a fallback is determined, `threeDSRequestorPriorAuthenticationInfo` is required.
+
+The requestor can set the TTL for the transaction by setting the `threeDSRequestorDecMaxTime`.
+The `threeDSRequestorDecMaxTime` accepts numeric values between `00001` and `10080` (7 days) which
+determines the TTL in minutes.
+
+The requestor shall use the `threeDSServerTransID` to retrieve the authentication value
+by making a request towards the `/postauth` endpoint.
+Once we receive the authentication value from the ACS, we will only store it for 20 minutes.
+We therefore suggest that the requestor should poll the `/postauth` endpoint at least every 20 minutes.
+The authentication value is deleted when the TTL has passed.
+
+If the 3-D Secure Server has not received the RReq message the following response will be returned:
+
+.. code-block:: json
+   :linenos:
+   :caption: Example RReq not received
+
+   {
+        "errorCode": "305",
+        "errorComponent": "S",
+        "errorDescription": "No RReq has been received",
+        "errorDetail": "No response from directory server yet",
+        "messageType": "Erro",
+        "messageVersion": "2.2.0",
+        "threeDSServerTransID": "8700f0ef-0e96-471c-b107-1d2534f3f5a5"
+   }   
+
+
+Decoupled authentication flow example
+**************************************
+
+The following examples show AReq and ARes messages for a decoupled authentication flow.
+
+.. code-block:: json
+   :linenos:
+   :caption: Example AReq, valid for 2.2.0.
+
+   {
+        "acctNumber": "3000100811112083",
+        "cardExpiryDate": "2410",
+        "acquirerBIN": "868491",
+        "acquirerMerchantID": "mGm6AJZ1YotkJJmOk0fx",
+        "mcc": "5411",
+        "merchantCountryCode": "840",
+        "merchantName": "Dummy Merchant",
+        "threeDSRequestorDecReqInd": "Y",
+        "threeDSRequestorDecMaxTime": "00001",
+        "messageType": "AReq",
+        "messageVersion": "2.2.0",
+        "messageCategory": "01",
+        "deviceChannel": "02",
+        "transType": "01",
+        "threeDSRequestorAuthenticationInd": "01",
+        "threeDSRequestorID": "az0123456789",
+        "threeDSRequestorName": "Example Requestor name",
+        "threeDSRequestorURL": "https://threedsrequestor.adomainname.net",
+        "purchaseAmount": "101",
+        "purchaseCurrency": "840",
+        "purchaseExponent": "2",
+        "cardholderName": "Cardholder Name",
+        "email": "example@example.com",
+        "mobilePhone": {
+          "cc": "123",
+          "subscriber": "123456789"
+        },
+        "billAddrCity": "Bill City Name",
+        "billAddrCountry": "840",
+        "billAddrLine1": "Bill Address Line 1",
+        "billAddrPostCode": "Bill Post Code",
+        "billAddrState": "CO",
+        "shipAddrCity": "Ship City Name",
+        "shipAddrCountry": "840",
+        "shipAddrLine1": "Ship Address Line 1",
+        "shipAddrPostCode": "Ship Post Code",
+        "shipAddrState": "CO"
+    }
+
+
+.. code-block:: json
+   :linenos:
+   :caption: Example ARes, valid for 2.2.0.
+
+   {
+        "acsChallengeMandated": "Y",
+        "acsDecConInd": "Y",
+        "acsOperatorID": "3dsecureio-standin-acs",
+        "acsReferenceNumber": "3dsecureio-standin-acs",
+        "acsTransID": "fb95703f-92e7-4278-a20c-62b9a9200e84",
+        "authenticationType": "04",
+        "cardholderInfo": "01",
+        "dsReferenceNumber": "3dsecureio-standin-ds",
+        "dsTransID": "87cbe14f-5960-4a01-a0bb-ae2c9871804a",
+        "messageType": "ARes",
+        "messageVersion": "2.2.0",
+        "threeDSServerTransID": "5a8007b9-6d26-49cf-a371-3f722bba4ffc",
+        "transStatus": "D"
+    }
+
+.. code-block:: json
+   :linenos:
+   :caption: Example RReq, valid for 2.2.0.
+
+   {
+        "acsTransID": "fb95703f-92e7-4278-a20c-62b9a9200e84",
+        "authenticationType": "04",
+        "authenticationValue": "s3xYIbbZVSakGpUEaAtOfIt2Ohs=",
+        "dsTransID": "87cbe14f-5960-4a01-a0bb-ae2c9871804a",
+        "eci": "05",
+        "interactionCounter": "00",
+        "messageCategory": "01",
+        "messageType": "RReq",
+        "messageVersion": "2.2.0",
+        "threeDSServerTransID": "5a8007b9-6d26-49cf-a371-3f722bba4ffc",
+        "transStatus": "Y"
+   }
diff --git a/source/guides.rst b/source/guides.rst
index 0b84972..612d18b 100644
--- a/source/guides.rst
+++ b/source/guides.rst
@@ -10,6 +10,7 @@ Guides
    versioning
    3dsmethod
    challenge_flow
+   decoupled_authentication
 
 These guides are designed to assist you in integration by using examples.
 
@@ -25,3 +26,7 @@ These guides are designed to assist you in integration by using examples.
 
 :ref:`Challenge Flow <3ds_challenge_flow>`
   Guides you through the Challenge Flow implementation.
+
+:ref:`Decoupled Authentication <3ds_decoupled_authentication>`
+  Guides you through the Decoupled Authentication implementation.
+