diff --git a/LICENSE b/LICENSE
index cf21105..e83375e 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021 Thibaut Cuvelier
+Copyright (c) 2021 Thibaut Cuvelier and contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/src/Chuffed.jl b/src/Chuffed.jl
index 8717753..30ee314 100644
--- a/src/Chuffed.jl
+++ b/src/Chuffed.jl
@@ -1,3 +1,8 @@
+# Copyright (c) 2021 Thibaut Cuvelier and contributors
+#
+# Use of this source code is governed by an MIT-style license that can be found
+# in the LICENSE.md file or at https://opensource.org/licenses/MIT.
+
 module Chuffed
 
 import ConstraintProgrammingExtensions
diff --git a/test/MOI.jl b/test/MOI.jl
index ec74a8e..d78889e 100644
--- a/test/MOI.jl
+++ b/test/MOI.jl
@@ -1,7 +1,12 @@
+# Copyright (c) 2021 Thibaut Cuvelier and contributors
+#
+# Use of this source code is governed by an MIT-style license that can be found
+# in the LICENSE.md file or at https://opensource.org/licenses/MIT.
+
 @testset "MOI interface" begin
     @testset "basic.fzn" begin
         model = optimizer(Int)
-        
+
         @test MOI.supports_add_constrained_variable(model, MOI.Integer)
         @test MOI.supports_constraint(CP.FlatZinc.Model(), MOI.ScalarAffineFunction{Int}, MOI.LessThan{Int})
 
@@ -25,7 +30,7 @@
 
     @testset "Infeasible" begin
         model = optimizer(Int)
-        
+
         @test MOI.supports_add_constrained_variable(model, MOI.Integer)
         @test MOI.supports_constraint(CP.FlatZinc.Model(), MOI.ScalarAffineFunction{Int}, MOI.LessThan{Int})
 
diff --git a/test/chuffed.jl b/test/chuffed.jl
index 91972f0..89c5563 100644
--- a/test/chuffed.jl
+++ b/test/chuffed.jl
@@ -1,3 +1,8 @@
+# Copyright (c) 2021 Thibaut Cuvelier and contributors
+#
+# Use of this source code is governed by an MIT-style license that can be found
+# in the LICENSE.md file or at https://opensource.org/licenses/MIT.
+
 # TODO: move the samples to CP?? Not all solvers will understand all FZN files :/.
 @testset "Sanity check for Chuffed" begin
     @testset "basic.fzn" begin
diff --git a/test/runtests.jl b/test/runtests.jl
index 767bf26..7d5696f 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,3 +1,8 @@
+# Copyright (c) 2021 Thibaut Cuvelier and contributors
+#
+# Use of this source code is governed by an MIT-style license that can be found
+# in the LICENSE.md file or at https://opensource.org/licenses/MIT.
+
 using Chuffed
 using MathOptInterface
 using ConstraintProgrammingExtensions