diff --git a/Interfaces.md b/Interfaces.md
index cec3960..176bce6 100644
--- a/Interfaces.md
+++ b/Interfaces.md
@@ -1,9 +1,9 @@
 ## ggs_vm_runner
 
 <pre>
-ggs_vm_runner:start_link() -> GameVm
-ggs_vm_runner:define(GameVM, SourceCode) -> ok
-ggs_vm_runner:user_command(GameVM, User, Command, Args) -> ok
+start_link() -> GameVm
+define(GameVM, SourceCode) -> ok
+user_command(GameVM, User, Command, Args) -> ok
 </pre>
 
 Only `start_link()` has a return value, the other two always return `ok`.
@@ -19,3 +19,11 @@ handle_cast({game, Command, Headers, Data}, State) -> {noreply, NewState}</pre>
 - `Data` is just a String.
 - `server` and `game` are atoms to indicate the receiver.
 - `Command` is just a String.
+
+## ggs_protocol
+
+<pre>parse(RawData) -> {Headers, DataString}
+create(Headers, DataString) -> RawData
+</pre>
+
+- `Headers` are a proplist [[http://www.erlang.org/doc/man/proplists.html]] so you can use proplist:get_value(token) to get the value of the header "Token".
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