Updated CSteamGroup (markdown)

CSteamGroup.md

@@ -51,15 +51,27 @@ How many group members were online on Steam when `getSteamGroup` was called
 
 Returns a URL where you can download this group's avatar.
 
-### getMembers(callback)
+### getMembers([addresses, ]callback)
+- `addresses` - Optional. An array of IP addresses (in `x.x.x.x` format) that will be rotated between when paging through the results. See below for details.
 - `callback` - Called when the member list is available
     - `err` - `null` on success, an `Error` object on failure
     - `members` - An array of `SteamID` objects
 
 **Non-object method name: `getGroupMembers`**
 
+**v3.5.0 or later is required to use the `addresses` argument.**
+
 Retrieves a list of all users in this group. For large groups this could take around 30 seconds, possibly longer.
 
+Steam returns at most 1000 users per page. Therefore, `node-steamcommunity` will need to make ceil(totalMembers / 1000) HTTP requests to fulfill this request. steamcommunity.com will start rate-limiting us after around 60 requests. If you supply an array of IP addresses which are accessible to this machine as the `addresses` argument, then `node-steamcommunity` will rotate between them for each request.
+
+**Important:** If using non-object methods, then you'll need to use differently-named methods depending on whether or not you want to use `addresses`.
+
+- To **not** use `addresses`:
+    - `community.getGroupMembers(groupID, callback)`
+- To use `addresses`:
+    - `dcommunity.getGroupMembersEx(groupID, addresses, callback)`
+
 ### join([callback])
 - `callback` - Called when the request completes
     - `err` - `null` on success, an `Error` object on failure