Update old document, now with 3 parameters.

Change-Id: I42cb494018c3d532635ebe384b32e7b59ef631d1
diff --git a/src/main/resources/Documentation/rest-api.md b/src/main/resources/Documentation/rest-api.md
index d287480..435b12b 100644
--- a/src/main/resources/Documentation/rest-api.md
+++ b/src/main/resources/Documentation/rest-api.md
@@ -11,7 +11,7 @@
 GET /changes/<id>/owners HTTP/1.0
 ```
 
-The `<id>` is a Gerrit change ID. This API can have two parameters:
+The `<id>` is a Gerrit change ID. This API can have three parameters:
 
 * **patchset**: is the patchset number of the change to look for changed files.
   By default the current (latest) patchset of given change is used.