diff --git a/spec-0000/index.md b/spec-0000/index.md
index 0bdf2f53..03b14625 100644
--- a/spec-0000/index.md
+++ b/spec-0000/index.md
@@ -18,6 +18,7 @@ endorsed-by:
   - matplotlib
   - networkx
   - numpy
+  - pysal
   - scikit-image
   - scipy
   - xarray