diff --git a/README.md b/README.md
index 89d5a9b..e021d9d 100644
--- a/README.md
+++ b/README.md
@@ -48,3 +48,5 @@ This software was developed with SPM8 under Matlab R2015a, but later
 versions should work, too. It is released under the terms of the GNU
 General Public License, version 3 or later.
 
+    This file is part of v1.0.0 of prevalence-permutation, see
+    https://github.com/allefeld/prevalence-permutation/releases
diff --git a/prevalence.m b/prevalence.m
index 2ae3e70..5fa7b66 100644
--- a/prevalence.m
+++ b/prevalence.m
@@ -26,6 +26,9 @@ function prevalence(ifn, P2, alpha, prefix)
 % See also prevalenceCore
 %
 %
+% This file is part of v1.0.0 of prevalence-permutation, see
+% https://github.com/allefeld/prevalence-permutation/releases
+%
 % Copyright (C) 2016 Carsten Allefeld
 %
 % This program is free software: you can redistribute it and/or modify it
diff --git a/prevalenceCore.m b/prevalenceCore.m
index ef96302..32c567a 100644
--- a/prevalenceCore.m
+++ b/prevalenceCore.m
@@ -44,6 +44,9 @@
 % See also prevalence.
 %
 %
+% This file is part of v1.0.0 of prevalence-permutation, see
+% https://github.com/allefeld/prevalence-permutation/releases
+%
 % Copyright (C) 2016 Carsten Allefeld
 %
 % This program is free software: you can redistribute it and/or modify it
diff --git a/prevalenceTest.m b/prevalenceTest.m
index 7e5b433..9db9dda 100644
--- a/prevalenceTest.m
+++ b/prevalenceTest.m
@@ -28,6 +28,9 @@
 %   d23d16395900d13c2e7b8976afc0edc5  prevalence_pcMN.nii
 %   8ac8c45ee7314adfc16172c451442a22  prevalence_puGN.nii
 %   d98ef36d1815e2632d0cd38358f95827  prevalence_puMN.nii
+%
+% This file is part of v1.0.0 of prevalence-permutation, see
+% https://github.com/allefeld/prevalence-permutation/releases
 
 clear, close all
 
diff --git a/saveMRImage.m b/saveMRImage.m
index 317cff9..9913763 100644
--- a/saveMRImage.m
+++ b/saveMRImage.m
@@ -14,6 +14,9 @@
 % The data type is is determined by the class of data.
 %
 %
+% This file is part of v1.0.0 of prevalence-permutation, see
+% https://github.com/allefeld/prevalence-permutation/releases
+%
 % Copyright (C) 2013–2016 Carsten Allefeld
 %
 % This program is free software: you can redistribute it and/or modify it