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diff --git a/chapter1.pdf b/chapter1.pdf
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diff --git a/sad_comparison_refs.bib b/sad_comparison_refs.bib
index b1ff1bc..7b93434 100644
--- a/sad_comparison_refs.bib
+++ b/sad_comparison_refs.bib
@@ -610,7 +610,7 @@ @article{xiao2016
           David J. Harris and
           Elita Baldridge and
           Ethan White},
-  journal={Zenodo},
+  journal={Zenodo. http://doi.org/10.5281/zenodo.166721},
   title={weecology/macroecotools: v0.4.0},
   month=nov,
   year=2016,