diff --git a/ch3/readme.md b/ch3/readme.md
index 237ed61..58865e4 100644
--- a/ch3/readme.md
+++ b/ch3/readme.md
@@ -3,4 +3,7 @@ Models and additional files for chapter 3 of *Agent-based Modeling for Archaeolo
 
 You will write the model yourself as you work through the chapter but can use our version to check your work. 
 
-Note that on GitHub the usual method of right-clicking a file and choosing "Save Link As..." will not work (you'll get a github webpage version of the file which won't work in NetLogo). Instead left-click on the file you want, then locate the `RAW` button in the top-right. Right-click that and "Save Link As..." to download the files correctly. Alternatively, install [GitHub Desktop](https://desktop.github.com/) and *clone* the whole repository (~100mb).
\ No newline at end of file
+Note that on GitHub the usual method of right-clicking a file and choosing "Save Link As..." will not work (you'll get a github webpage version of the file which won't work in NetLogo). Instead left-click on the file you want, then locate the `RAW` button in the top-right. Right-click that and "Save Link As..." to download the files correctly. Alternatively, install [GitHub Desktop](https://desktop.github.com/) and *clone* the whole repository (~100mb).
+
+________________________________________________________________________________________________________________________
+This textbook and code repository are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License