add copyright and a license

Signed-off-by: Lars Wirzenius <liw@liw.fi>
Sponsored-by: author

1 files changed, 10 insertions, 0 deletions

diff --git a/index.mdwn b/index.mdwn
index cf15fda..1e8d6ad 100644
--- a/index.mdwn
+++ b/index.mdwn
@@ -596,3 +596,13 @@ a GTD system for myself.
 # Acknowledgments {.unnumbered}
 
 Thank you to Greg Grossmeier and Heiko Schäfer for feedback on this document.
+
+# Copyright {.unnumbered}
+
+Copyright 2023  Lars Wirzenius
+
+This text is released under the [Creative Commons CC BY-SA 4.0
+International](https://creativecommons.org/licenses/by-sa/4.0/)
+license.
+
+You can contact Lars via <https://liw.fi>.