diff --git a/TODO.md b/TODO.md
index 8b6039c..229af2f 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,3 +1,11 @@
 # Performance
 
-Search with some kind of "pagination" system: ask entries with a limit on the number of elements and an offset.
+- Search with some kind of "pagination" system: ask entries with a limit on the number of elements and an offset.
+- Rewrite the `each_with_index` function: use a *limit* parameter instead of an *end_offset*.
+- RAMOnly: do not read/write the `last_entry` file.
+- Use the `#unsafe_add` function when possible.
+
+# Documentation
+
+- Write the API documentation.
+- Finish the PDF to explain *why DODB*.