diff --git a/EPR-ADR-Simulator/user.md b/EPR-ADR-Simulator/user.md
index c02653f65050f9549edf9cd8202db916a93c604a..943855368695091370dbe2a0953424cd6e4adc2d 100755
--- a/EPR-ADR-Simulator/user.md
+++ b/EPR-ADR-Simulator/user.md
@@ -293,4 +293,8 @@ It requires TLS mutual authentication with testing certificate (from GSS PKI). [
       </xacml-samlp:XACMLAuthzDecisionQuery>
    </soap:Body>
 </soap:Envelope>
-```
\ No newline at end of file
+```
+
+## Mock messages on GWT
+
+The mock messages feature is available for this mock from 1.3.0 version. 
diff --git a/EPR-ATC-Simulator/user.md b/EPR-ATC-Simulator/user.md
index a446755e2fa23c5645587198b4b07d3561f7f3df..469bf087586bf6c1acfe6c0cafba204f167b4aca 100755
--- a/EPR-ATC-Simulator/user.md
+++ b/EPR-ATC-Simulator/user.md
@@ -120,3 +120,7 @@ Here is an example URI for a requets on patient with ID **761337610430891416^^^S
 ```
 http://ehealthsuisse.ihe-europe.net:8096/atc-record-repository/ARRservice/AuditEvent?date=ge2015-01-00&date=le2020-01-00&entity-id=urn:oid:2.16.756.5.30.1.127.3.10.3|761337610430891416
 ```
+
+## Mock messages on GWT
+
+The mock messages feature is available for this mock from 1.2.1 version. 
diff --git a/EPR-Assertion-Provider-Simulator/user.md b/EPR-Assertion-Provider-Simulator/user.md
index a30c2a35d56a03bc274c0363a5d9b15bce261c08..d01073955cfb79adb669237a4da8cea02f67dc37 100644
--- a/EPR-Assertion-Provider-Simulator/user.md
+++ b/EPR-Assertion-Provider-Simulator/user.md
@@ -904,3 +904,7 @@ gB6320GPGg==</ds:DigestValue>
 </env:Envelope>
 ```
 
+## Mock messages on GWT
+
+The mock messages feature is available for this mock from 1.1.0 version. 
+
diff --git a/EPR-PPQ-Simulator/user.md b/EPR-PPQ-Simulator/user.md
index ae7478f3e69b7e866f353fcf6ab9059bb0cd2e3a..fa79f2e0e15fd2e4f975906f64941b5fc8b8ea1f 100755
--- a/EPR-PPQ-Simulator/user.md
+++ b/EPR-PPQ-Simulator/user.md
@@ -284,4 +284,7 @@ It requires TLS mutual authentication with testing certificate (from GSS PKI). [
       </epr:DeletePolicyRequest>
    </soap:Body>
 </soap:Envelope>
-```
\ No newline at end of file
+```
+## Mock messages on GWT
+
+The mock messages feature is available for this mock from 1.3.0 version. 
diff --git a/EPR-XDSMU-Simulator/user.md b/EPR-XDSMU-Simulator/user.md
index 17334c046426b569a887d641b317f234293186b7..47a154c20cf1de892ee70235f6f894592ac8335c 100755
--- a/EPR-XDSMU-Simulator/user.md
+++ b/EPR-XDSMU-Simulator/user.md
@@ -696,4 +696,8 @@ The actors involved in this profile are : Initiator, Responder and Document Regi
       </query:AdhocQueryResponse>
    </S:Body>
 </S:Envelope>
-```
\ No newline at end of file
+```
+
+## Mock messages on GWT
+
+The mock messages feature is available for this mock from 1.3.0 version. 
diff --git a/Gazelle-Webservice-Tester/user.md b/Gazelle-Webservice-Tester/user.md
index e8bd8835cdc4a2aa2f334a2f3a30892c6ad2df61..96dc13e6d5be6ea944770e084f0f5d12a86a9eaa 100644
--- a/Gazelle-Webservice-Tester/user.md
+++ b/Gazelle-Webservice-Tester/user.md
@@ -4,7 +4,7 @@ subtitle: Gazelle Webservice Tester
 author: Malo TOUDIC
 function: Software developer
 date: 05/03/2019
-toolversion: 1.6.x
+toolversion: 1.7.x
 version: 1.02
 status: Approved document
 reference: KER1-MAN-IHE-GAZELLE_WEBSERVICE_TESTER_USER
@@ -23,7 +23,7 @@ In addition, the tool is linked to Gazelle Test Management which allows the user
 
 # Log in
 
-In most case, you will have to be logged in to perform actions in Gazelle Webservice Tester. To do so, click on the **CAS Login** button (top right), and input your testing session credentials.
+In most case, you will have to be logged in order to perform actions in Gazelle Webservice Tester. To do so, click on the **CAS Login** button (top right), and input your testing session credentials.
 
 # Execute a project
 
@@ -161,3 +161,24 @@ Once you have performed the cross validation, **its status and permanent link**
 
 It is still possible to perform a cross validation again by clicking on the new **refresh icon**.
 It will replace the previous cross validation retrieved informations with this cross validator's new ones.
+
+# Mock messages
+
+In **Mock Messages** menu, exchanged messages with mocks are separated from other messages obtained when communicating with simulators in Gazelle Webservice Tester
+as part of transactions.
+
+**WARNING** : This feature is only available to several mocks as specific configurations are required in their implementation. 
+Please refer to mocks user manuals to know if they hold the configurations to use this feature.
+
+## Messages browser
+
+Messages exchanged with mocks are gathered in a table with informations on their context of use (timestamp, transaction, initiator, responder, etc.).
+They can be filtered using those informations in the filter panel.
+For each transaction, actions such as validation with EVSClient and messages details are available.
+
+## Message details
+
+Clicking on the magnifying glass in the Action column is redirecting to an overview on messages content.
+Validation using EVSClient is possible too by clicking on 'Validate Again' button. Informations on the validation are displayed
+once it has been performed and you have been redirected back to Gazelle Webservice Tester.
+