diff --git a/README.md b/README.md
index 14f6d71..d117fd2 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,6 @@
 - from the repo's root directory, run `./box_setup`
 
 ### todo items
-- review primeagen's runs dir
 - nvim config
 - consider: optional vim config as a backup?
 - decide on and implement approach for languages and versioning
diff --git a/installs_and_builds/s03_shells b/installs_and_builds/s03_shells
new file mode 100755
index 0000000..6fcbba3
--- /dev/null
+++ b/installs_and_builds/s03_shells
@@ -0,0 +1,3 @@
+#!/bin/zsh
+
+${=BOX_SETUP_INSTALL_COMMAND} zsh