diff --git a/README.md b/README.md
index b2e81e6..6db98d5 100644
--- a/README.md
+++ b/README.md
@@ -388,3 +388,10 @@ Please note that this website is still under construction and needs some more
 care.
 
 You can mail author to fatalerrors \<at\> geoffray-levasseur \<dot\> org.
+
+-----------------------------------------------------------------------------
+
+Documentation (c) 2019-2021 Geoffray Levasseur.
+
+This file is distributed under3-clause BSD license. The complete license
+agreement can be obtained at: https://opensource.org/licenses/BSD-3-Clause
diff --git a/doc/dev.md b/doc/dev.md
index 9d9b89b..99fc707 100644
--- a/doc/dev.md
+++ b/doc/dev.md
@@ -593,3 +593,9 @@ work.
 
 #### 10.1.5. ```process_commandline_and_vars```
 
+-----------------------------------------------------------------------------
+
+Documentation (c) 2019-2021 Geoffray Levasseur.
+
+This file is distributed under3-clause BSD license. The complete license
+agreement can be obtained at: https://opensource.org/licenses/BSD-3-Clause
diff --git a/doc/todo.md b/doc/todo.md
index 2e1c4ee..a5b9aed 100644
--- a/doc/todo.md
+++ b/doc/todo.md
@@ -26,3 +26,10 @@ What will never appear in that todo list (so don't ask) :
  * Windows: don't ask for Windows support, it will never happens
  * MacOS: same as above
  * Base language change: the heart of init.sh is BASH, and will always be
+
+-----------------------------------------------------------------------------
+
+Documentation (c) 2019-2021 Geoffray Levasseur.
+
+This file is distributed under3-clause BSD license. The complete license
+agreement can be obtained at: https://opensource.org/licenses/BSD-3-Clause