diff --git a/hdl/src/message_build.sv b/hdl/src/message_build.sv
index 7cbfc3236900201bd31b9193f43bdae2764241bb..24b8575ed4c1e0c698b550d33629d895665584d8 100644
--- a/hdl/src/message_build.sv
+++ b/hdl/src/message_build.sv
@@ -1,3 +1,13 @@
+//-----------------------------------------------------------------------------
+// SoC Labs Basic SHA-2 Message Builder Module
+// A joint work commissioned on behalf of SoC Labs, under Arm Academic Access license.
+//
+// Contributors
+//
+// David Mapstone (d.a.mapstone@soton.ac.uk)
+//
+// Copyright  2022, SoC Labs (www.soclabs.org)
+//-----------------------------------------------------------------------------
 module message_build (
     input logic clk,
     input logic nrst,
diff --git a/hdl/verif/tb_message_build.sv b/hdl/verif/tb_message_build.sv
index dc62b90fb687f487bb070bfd9cf0a65aaf04abce..37d54962e633f1bd54db72b1dfa38fab4ff993c1 100644
--- a/hdl/verif/tb_message_build.sv
+++ b/hdl/verif/tb_message_build.sv
@@ -1,5 +1,5 @@
 //-----------------------------------------------------------------------------
-// SoC Labs Basic SHA-2 Engine Testbench
+// SoC Labs Basic SHA-2 Message Builder Testbench
 // A joint work commissioned on behalf of SoC Labs, under Arm Academic Access license.
 //
 // Contributors