diff --git a/config/alfresco/templates/webscripts/org/alfresco/repository/replication/replication-definition.put.desc.xml b/config/alfresco/templates/webscripts/org/alfresco/repository/replication/replication-definition.put.desc.xml
new file mode 100644
index 0000000000..eb1cc246f5
--- /dev/null
+++ b/config/alfresco/templates/webscripts/org/alfresco/repository/replication/replication-definition.put.desc.xml
@@ -0,0 +1,8 @@
+<webscript>
+  <shortname>Updates a persisted Replication Definition</shortname>
+  <description>Updates a previously persisted replication defintion with the supplied details</description>
+  <url>/api/replication-definition/{replication_definition_name}</url>
+  <format default="json"/>
+  <authentication>admin</authentication>
+  <transaction>required</transaction>
+</webscript>
diff --git a/config/alfresco/templates/webscripts/org/alfresco/repository/replication/replication-definition.put.json.ftl b/config/alfresco/templates/webscripts/org/alfresco/repository/replication/replication-definition.put.json.ftl
new file mode 100644
index 0000000000..e92ce023ee
--- /dev/null
+++ b/config/alfresco/templates/webscripts/org/alfresco/repository/replication/replication-definition.put.json.ftl
@@ -0,0 +1,2 @@
+<#import "replication-definition.lib.ftl" as replicationDefLib />
+<@replicationDefLib.replicationDefinitionJSON replicationDefinition=replicationDefinition />
diff --git a/config/alfresco/web-scripts-application-context.xml b/config/alfresco/web-scripts-application-context.xml
index 6a4ebd1eac..824aefea1d 100644
--- a/config/alfresco/web-scripts-application-context.xml
+++ b/config/alfresco/web-scripts-application-context.xml
@@ -870,4 +870,10 @@
           parent="abstractReplicationWebScript">
     </bean>
 
+    <!-- Updates a replication definition -->
+    <bean id="webscript.org.alfresco.repository.replication.replication-definition.put"
+          class="org.alfresco.repo.web.scripts.replication.ReplicationDefinitionPut"
+          parent="abstractReplicationWebScript">
+    </bean>
+
 </beans>
diff --git a/source/java/org/alfresco/repo/web/scripts/replication/ReplicationDefinitionGet.java b/source/java/org/alfresco/repo/web/scripts/replication/ReplicationDefinitionGet.java
index f59475f76f..8fb8519573 100644
--- a/source/java/org/alfresco/repo/web/scripts/replication/ReplicationDefinitionGet.java
+++ b/source/java/org/alfresco/repo/web/scripts/replication/ReplicationDefinitionGet.java
@@ -18,8 +18,6 @@
  */
 package org.alfresco.repo.web.scripts.replication;
 
-import java.util.Comparator;
-import java.util.List;
 import java.util.Map;
 
 import org.alfresco.service.cmr.replication.ReplicationDefinition;
diff --git a/source/java/org/alfresco/repo/web/scripts/replication/ReplicationDefinitionPut.java b/source/java/org/alfresco/repo/web/scripts/replication/ReplicationDefinitionPut.java
new file mode 100644
index 0000000000..a5f8a03b8a
--- /dev/null
+++ b/source/java/org/alfresco/repo/web/scripts/replication/ReplicationDefinitionPut.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2005-2010 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.repo.web.scripts.replication;
+
+import java.io.IOException;
+import java.util.Map;
+
+import org.alfresco.service.cmr.replication.ReplicationDefinition;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.json.JSONTokener;
+import org.springframework.extensions.webscripts.Cache;
+import org.springframework.extensions.webscripts.Status;
+import org.springframework.extensions.webscripts.WebScriptException;
+import org.springframework.extensions.webscripts.WebScriptRequest;
+
+
+/**
+ * @author Nick Burch
+ * @since 3.4
+ */
+public class ReplicationDefinitionPut extends AbstractReplicationWebscript
+{
+   @Override
+   protected Map<String, Object> buildModel(ReplicationModelBuilder modelBuilder, 
+                                            WebScriptRequest req, Status status, Cache cache)
+   {
+       // Which definition did they ask for?
+       String replicationDefinitionName = 
+          req.getServiceMatch().getTemplateVars().get("replication_definition_name");
+       ReplicationDefinition replicationDefinition =
+          replicationService.loadReplicationDefinition(replicationDefinitionName);
+      
+       // Does it exist?
+       if(replicationDefinition == null) {
+          throw new WebScriptException(
+                Status.STATUS_NOT_FOUND, 
+                "No Replication Definition found with that name"
+          );
+       }
+       
+       // Grab the JSON, and prepare to update 
+       try 
+       {
+           JSONObject json = new JSONObject(new JSONTokener(req.getContent().getContent()));
+           
+           // Are they trying to rename?
+           if(json.has("name")) {
+              String jsonName = json.getString("name");
+              if(! jsonName.equals(replicationDefinitionName)) {
+                 // Name has changed, rename it
+                 replicationService.renameReplicationDefinition(
+                       replicationDefinitionName,
+                       jsonName
+                 );
+              }
+           }
+           
+           // Update everything else
+           updateDefinitionProperties(replicationDefinition, json);
+           
+           // Save the changes
+           replicationService.saveReplicationDefinition(replicationDefinition);
+       }
+       catch (IOException iox)
+       {
+           throw new WebScriptException(Status.STATUS_BAD_REQUEST, "Could not read content from request.", iox);
+       }
+       catch (JSONException je)
+       {
+           throw new WebScriptException(Status.STATUS_BAD_REQUEST, "Could not parse JSON from request.", je);
+       }
+      
+       // Return the new details on it
+       return modelBuilder.buildDetails(replicationDefinition);
+   }
+}
\ No newline at end of file
diff --git a/source/java/org/alfresco/repo/web/scripts/replication/ReplicationRestApiTest.java b/source/java/org/alfresco/repo/web/scripts/replication/ReplicationRestApiTest.java
index 4462acf6b6..8520137ee1 100644
--- a/source/java/org/alfresco/repo/web/scripts/replication/ReplicationRestApiTest.java
+++ b/source/java/org/alfresco/repo/web/scripts/replication/ReplicationRestApiTest.java
@@ -42,6 +42,7 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.extensions.webscripts.Status;
 import org.springframework.extensions.webscripts.TestWebScriptServer.GetRequest;
 import org.springframework.extensions.webscripts.TestWebScriptServer.PostRequest;
+import org.springframework.extensions.webscripts.TestWebScriptServer.PutRequest;
 import org.springframework.extensions.webscripts.TestWebScriptServer.Response;
 
 /**
@@ -677,8 +678,66 @@ public class ReplicationRestApiTest extends BaseWebScriptTest
        // Check the database for these
        // TODO
        
+       // Ensure we can't create with a duplicate name
+       // TODO
     }
     
+    public void testReplicationDefinitionPut() throws Exception
+    {
+       Response response;
+       
+       
+       // Not allowed if you're not an admin
+       AuthenticationUtil.setFullyAuthenticatedUser(AuthenticationUtil.getGuestUserName());
+       response = sendRequest(new PutRequest(URL_DEFINITION + "MadeUp", "", JSON), Status.STATUS_UNAUTHORIZED);
+       assertEquals(Status.STATUS_UNAUTHORIZED, response.getStatus());
+       
+       AuthenticationUtil.setFullyAuthenticatedUser(USER_NORMAL);
+       response = sendRequest(new PutRequest(URL_DEFINITION + "MadeUp", "", JSON), Status.STATUS_UNAUTHORIZED);
+       assertEquals(Status.STATUS_UNAUTHORIZED, response.getStatus());
+
+       
+       // Ensure there aren't any to start with
+       AuthenticationUtil.setFullyAuthenticatedUser(AuthenticationUtil.getAdminUserName());
+       assertEquals(0, replicationService.loadReplicationDefinitions().size());
+       
+       
+       // You need to specify a real definition
+       response = sendRequest(new PutRequest(URL_DEFINITION + "MadeUp", "", JSON), Status.STATUS_NOT_FOUND);
+       assertEquals(Status.STATUS_NOT_FOUND, response.getStatus());
+       
+       
+       // Create one, and change it
+       ReplicationDefinition rd = replicationService.createReplicationDefinition("Test", "Testing");
+       replicationService.saveReplicationDefinition(rd);
+       
+       response = sendRequest(new PutRequest(URL_DEFINITION + "Test", "{}", JSON), Status.STATUS_OK);
+       assertEquals(Status.STATUS_OK, response.getStatus());
+       
+       
+       // Check we got the right information back on it
+       // TODO
+       
+       // Change some details, and see them updated in both
+       //  the JSON and on the object in the repo
+       // TODO
+       
+       // Create a 2nd definition, and check that the correct
+       //  one gets updated
+       // TODO
+       
+       // Change the payload, and see the right information in
+       //  the response JSON for it
+       // TODO
+       
+       // Rename to a taken name, won't be allowed
+       // TODO
+       
+       // Rename to a spare name, will be changed
+       // TODO
+    }
+    
+    
     @Override
     protected void setUp() throws Exception
     {