diff --git a/README.md b/README.md
index 0c67a8ac2d9d1c282bd0d5edb5f7b55e586e34c8..b445f9a0f40426833f3a6886f06ffbacd991d772 100644
--- a/README.md
+++ b/README.md
@@ -3,5 +3,7 @@
 Pystac extension for instrument, implementing https://schemas.stacspec.org/v1.1.0/item-spec/json-schema/instrument.json
 
 ```
-pip install pystac-extension-instrument --index-url https://forgemia.inra.fr/api/v4/projects/14446/packages/pypi/simple
+pip install pystac-extension-instrument \
+  --index-url https://forgemia.inra.fr/api/v4/projects/14446/packages/pypi/simple \
+  --index-url https://forgemia.inra.fr/api/v4/projects/14431/packages/pypi/simple
 ```