diff --git a/spec-0004/index.md b/spec-0004/index.md
index bfdd1187..def86785 100644
--- a/spec-0004/index.md
+++ b/spec-0004/index.md
@@ -16,6 +16,7 @@ endorsed-by:
   - numpy
   - scikit-image
   - scipy
+  - IPython
 ---
 
 ## Description