diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 00000000..c23af94d
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.2.0
diff --git a/README.md b/README.md
index ad094b19..934cbc54 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,10 @@
 # imagecat-rails
-A rewrite of imagecat.princeton.edu 
+
+A rewrite of a imagecat.princeton.edu 
 ---
 This catalog contains records for items cataloged before 1980.
 Records are arranged alphabetically with authors, titles, and subjects interfiled.
 
+## System dependencies
+
+This project uses [asdf](https://asdf-vm.com/) (see .tool-versions for the current ruby version)