diff --git a/ch9/readme.md b/ch9/readme.md
index 95e80cd..5a2f091 100644
--- a/ch9/readme.md
+++ b/ch9/readme.md
@@ -6,4 +6,4 @@ This chapter demonstrates how to analyse ABM results. Download the AmphorABM mod
 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).
 
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-This textbook and code repository are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
+This textbook and code repository are licensed under a [Creative Commons Attribution-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-sa/4.0/).