diff --git a/src/hz.erl b/src/hz.erl
index bc49137..7c10fa9 100644
--- a/src/hz.erl
+++ b/src/hz.erl
@@ -928,18 +928,17 @@ contract_create(CreatorID, Path, InitArgs) ->
     end.
 
 
--spec contract_create(CreatorID, Nonce,
-                      Amount, TTL, Gas, GasPrice,
-                      Path, InitArgs) -> Result
+-spec contract_create(CreatorID, Nonce, Gas, GP, Amount, TTL, Contract, InitArgs) -> Result
     when CreatorID :: pubkey(),
          Nonce     :: pos_integer(),
+         Gas       :: pos_integer(),
+         GP        :: pos_integer(), % Gas Price
          Amount    :: non_neg_integer(),
          TTL       :: non_neg_integer(),
-         Gas       :: pos_integer(),
-         GasPrice  :: pos_integer(),
-         Path      :: file:filename(),
-         InitArgs  :: [string()]
-                    | {erlang, [term()]}
+         Contract  :: {file,   file:filename()}
+                    | {source, binary()}
+                    | {build,  map()},
+         InitArgs  :: {erlang, [term()]}
                     | {fate,   [term()]}
                     | {sophia, [string()]},
          Result    :: {ok, CreateTX} | {error, Reason},