diff --git a/README.md b/README.md
index e472bd9f6..3f564aff6 100644
--- a/README.md
+++ b/README.md
@@ -221,7 +221,7 @@ To enhance CPython compatibility, try to increase unittest coverage by checking
 Another approach is to checkout the source code: builtin functions and object
 methods are often the simplest and easiest way to contribute.
 
-You can also simply run `./whats_left.py` to assist in finding any unimplemented
+You can also simply run `uv run python -I whats_left.py` to assist in finding any unimplemented
 method.
 
 ## Compiling to WebAssembly
diff --git a/whats_left.py b/whats_left.py
index 82df5cabe..90200b8ff 100755
--- a/whats_left.py
+++ b/whats_left.py
@@ -1,4 +1,7 @@
 #!/usr/bin/env -S python3 -I
+# /// script
+# requires-python = ">=3.13"
+# ///
 
 # This script generates Lib/snippets/whats_left_data.py with these variables defined:
 # expected_methods - a dictionary mapping builtin objects to their methods