Document how to switch from PATCH to PUT.

README.md

@@ -144,6 +144,14 @@ This assumes the CSRF token is available as a cookie named `csrftoken`.
 
 You could also use this delegate method as a final opportunity to make general changes to requests.
 
+### PUT vs PATCH
+
+By default Ratatosk will transmit any changes you make using `PATCH` requests which only contain the properties which were actually changed. This minimises traffic and reduces problems related to rewriting data considered read-only.
+
+If your server does not support the `PATCH` verb you can use `PUT` instead. With `PUT` requests the whole serialised form of the resource is "put" to the server for each change.
+
+    [[WLRemoteLink sharedRemoteLink] setSaveAction:WLRemoteActionPutType];
+
 ## License ##
 
 Free to use and modify under the terms of the BSD open source license.