diff --git a/Parallel/Parallel.ml b/Parallel/Parallel.ml
index f27b66d..d6db9e6 100644
--- a/Parallel/Parallel.ml
+++ b/Parallel/Parallel.ml
@@ -15,12 +15,41 @@ let rank =
   assert (result >= 0);
   result
 
+
 let master = rank = 0
 
+
 let barrier () =
   Mpi.barrier Mpi.comm_world
 
 
+let broadcast x =
+  Mpi.broadcast x 0 Mpi.comm_world
+
+
+let broadcast_int x =
+  Mpi.broadcast_int x 0 Mpi.comm_world
+
+
+let broadcast_int_array x =
+  Mpi.broadcast_int_array x 0 Mpi.comm_world
+
+
+let broadcast_float x =
+  Mpi.broadcast_float x 0 Mpi.comm_world
+
+
+let broadcast_float_array x =
+  Mpi.broadcast_float_array x 0 Mpi.comm_world
+
+
+let broadcast_vec x =
+  let a = Lacaml.D.Vec.to_array x  in
+  let a = broadcast_float_array a in
+  Lacaml.D.Vec.of_array a
+
+
+
 module Vec = struct
 
   type t = 
diff --git a/Parallel/Parallel.mli b/Parallel/Parallel.mli
index a535afa..1e48db2 100644
--- a/Parallel/Parallel.mli
+++ b/Parallel/Parallel.mli
@@ -12,6 +12,25 @@ val master : bool
 val barrier : unit -> unit
 (** Wait for all processes to reach this point. *)
 
+val broadcast : 'a -> 'a
+(** Broadcasts data to all processes. *)
+
+val broadcast_int : int -> int
+(** Broadcasts an [int] to all processes. *)
+
+val broadcast_float : float -> float
+(** Broadcasts a [float] to all processes. *)
+
+val broadcast_int_array : int array -> int array
+(** Broadcasts an [int array] to all processes. *)
+
+val broadcast_float_array : float array -> float array
+(** Broadcasts a [float array] to all processes. *)
+
+val broadcast_vec : Lacaml.D.vec -> Lacaml.D.vec
+(** Broadcasts a Lacaml vector to all processes. *)
+
+
 (** {5 Vector operations} *)
 module Vec : sig
 
diff --git a/run_parallel.ml b/run_parallel.ml
index fbe904f..afb24cc 100644
--- a/run_parallel.ml
+++ b/run_parallel.ml
@@ -9,7 +9,7 @@ let v = Parallel.Vec.init 47 (fun i -> float_of_int i) in
   let b = Array.init 41 (fun i -> float_of_int (3*i+1)) |> Lacaml.D.Vec.of_array in
   let v1 = Parallel.Vec.of_vec a in
   let v2 = Parallel.Vec.of_vec b in
-  let d1 = Parallel.dot v1 v2 in
+  let d1 = Parallel.dot v1 v2 |> Parallel.broadcast_float in
   let d2 = Lacaml.D.dot a b in
   (*
   let w = Parallel.Vec.to_vec v in