diff --git a/src/wuttjamaican/util.py b/src/wuttjamaican/util.py
index 296eec7..d743965 100644
--- a/src/wuttjamaican/util.py
+++ b/src/wuttjamaican/util.py
@@ -159,3 +159,7 @@ def parse_list(value):
         elif value.startswith("'") and value.endswith("'"):
             values[i] = value[1:-1]
     return values
+
+
+def foo():
+    raise NotImplementedError