diff --git a/spec-0001/index.md b/spec-0001/index.md
index e0a35887..482bcef9 100644
--- a/spec-0001/index.md
+++ b/spec-0001/index.md
@@ -10,6 +10,7 @@ author:
 endorsed-by:
   - ipython
   - networkx
+  - pysal
   - numpy
   - scikit-image
   - scikit-learn