diff --git a/docs/development/new-packages.md b/docs/development/new-packages.md
index c212b6a19..3dc679f6b 100644
--- a/docs/development/new-packages.md
+++ b/docs/development/new-packages.md
@@ -83,6 +83,7 @@ If you want to build the package, you will need to build Python which you can do
 as follows:
 
 ```bash
+make -C emsdk
 make -C cpython
 ```