diff --git a/src/digimarks/extract.py b/src/digimarks/extract.py
new file mode 100644
index 0000000..ce8b47d
--- /dev/null
+++ b/src/digimarks/extract.py
@@ -0,0 +1,6 @@
+from pydantic import AnyUrl
+
+
+def extract_contents(title: str, url: AnyUrl, note: str):
+    """Extract contents from a URL."""
+    return