Merge pull request #47 from jannotti/master

foreign ref sum

dev/ledger.md

@@ -646,10 +646,10 @@ An application call transaction additionally has the following fields:
 - Application IDs, besides the application whose `ApprovalProgram` or
   `ClearStateProgram` is executing, that the executing program may read global
   state from. This field is encoded as msgpack field `apfa`. The maximum number
-  of entries in this field is 2.
+  of entries in this field is 8.
 - Asset IDs that the executing program may read asset parameters from. This
   field is encoded as msgpack field `apas`. The maximum number of entries in
-  this field is 2.
+  this field is 8.
 - Local state schema, encoded as msgpack field `apls`. This field is only used
   during application creation, and sets bounds on the size of the local state
   for users who opt in to this application.
@@ -666,6 +666,10 @@ An application call transaction additionally has the following fields:
   both application creation and updates, and sets the corresponding
   application's `ClearStateProgram`.
 
+Furthermore, the sum of the number of Accounts in `apat`, Application IDs in
+`apfa`, and Asset IDs in `apas` is limited to 8.
+
+
 An asset configuration transaction additionally has the following fields:
 
  - The ID of the asset being configured, encoded as msgpack field `caid`.