diff --git a/doc/developers/doc-TODO b/doc/developers/doc-TODO
new file mode 100644
index 0000000..69f6907
--- /dev/null
+++ b/doc/developers/doc-TODO
@@ -0,0 +1,4 @@
+- Which fields are searched?
+  title, description, private note, username, tags
+
+- What are [isbn] and so for?