diff --git a/src/core/MOM_open_boundary.F90 b/src/core/MOM_open_boundary.F90
index 5968bfd924..be61791dc3 100644
--- a/src/core/MOM_open_boundary.F90
+++ b/src/core/MOM_open_boundary.F90
@@ -1,6 +1,8 @@
 !> Controls where open boundary conditions are applied 
 module MOM_open_boundary
 
+! This file is part of MOM6. See LICENSE.md for the license.
+
 use MOM_cpu_clock, only : cpu_clock_id, cpu_clock_begin, cpu_clock_end, CLOCK_ROUTINE
 use MOM_diag_mediator, only : diag_ctrl, time_type
 use MOM_domains, only : pass_var, pass_vector