diff --git a/MultiServer.py b/MultiServer.py
index b9ac9eef..a454284f 100644
--- a/MultiServer.py
+++ b/MultiServer.py
@@ -1466,7 +1466,13 @@ async def process_client_cmd(ctx: Context, client: Client, args: dict):
 
     elif cmd == "GetDataPackage":
         exclusions = args.get("exclusions", [])
-        if exclusions:
+        if "games" in args:
+            games = {name: game_data for name, game_data in network_data_package["games"].items()
+                     if name in set(args.get("games", []))}
+            await ctx.send_msgs(client, [{"cmd": "DataPackage",
+                                          "data": {"games": games}}])
+        # TODO: remove exclusions behaviour around 0.5.0
+        elif exclusions:
             exclusions = set(exclusions)
             games = {name: game_data for name, game_data in network_data_package["games"].items()
                      if name not in exclusions}
@@ -1474,6 +1480,7 @@ async def process_client_cmd(ctx: Context, client: Client, args: dict):
             package["games"] = games
             await ctx.send_msgs(client, [{"cmd": "DataPackage",
                                           "data": package}])
+
         else:
             await ctx.send_msgs(client, [{"cmd": "DataPackage",
                                           "data": network_data_package}])
diff --git a/Utils.py b/Utils.py
index a764dea9..b353e9a7 100644
--- a/Utils.py
+++ b/Utils.py
@@ -58,8 +58,7 @@ RetType = typing.TypeVar("RetType")
 
 
 def cache_argsless(function: typing.Callable[[], RetType]) -> typing.Callable[[], RetType]:
-    if function.__code__.co_argcount:
-        raise Exception("Can only cache 0 argument functions with this cache.")
+    assert not function.__code__.co_argcount, "Can only cache 0 argument functions with this cache."
 
     sentinel = object()
     result: typing.Union[object, RetType] = sentinel
@@ -482,7 +481,8 @@ class VersionException(Exception):
     pass
 
 
-def format_SI_prefix(value, power=1000, power_labels=('', 'k', 'M', 'G', 'T', "P", "E", "Z", "Y")):
+# noinspection PyPep8Naming
+def format_SI_prefix(value, power=1000, power_labels=('', 'k', 'M', 'G', 'T', "P", "E", "Z", "Y")) -> str:
     n = 0
 
     while value > power:
diff --git a/docs/network protocol.md b/docs/network protocol.md
index ae93e369..48b8448d 100644
--- a/docs/network protocol.md	
+++ b/docs/network protocol.md	
@@ -305,9 +305,9 @@ Basic chat command which sends text to the server to be distributed to other cli
 Requests the data package from the server. Does not require client authentication.
 
 #### Arguments
-| Name | Type | Notes |
-| ------ | ----- | ------ |
-| exclusions | list\[str\]  | Optional. If specified, will not send back the specified data. Such as, \["Factorio"\] -> Datapackage without Factorio data.|
+| Name  | Type | Notes                                                                                                                           |
+|-------| ----- |---------------------------------------------------------------------------------------------------------------------------------|
+| games | list\[str\]  | Optional. If specified, will only send back the specified data. Such as, \["Factorio"\] -> Datapackage with only Factorio data. |
 
 ### Bounce
 Send this message to the server, tell it which clients should receive the message and 
@@ -569,7 +569,6 @@ Note:
 | Name | Type | Notes |
 | ------ | ----- | ------ |
 | games | dict[str, GameData] | Mapping of all Games and their respective data |
-| version | int | Sum of all per-game version numbers, for clients that don't bother with per-game caching/updating. |
 
 #### GameData
 GameData is a **dict** but contains these keys and values. It's broken out into another "type" for ease of documentation.