diff --git a/TODO.md b/TODO.md
index 6cd0700..087c219 100644
--- a/TODO.md
+++ b/TODO.md
@@ -5,6 +5,11 @@
 - RAMOnly: do not read/write the `last_entry` file.
 - Use the `#unsafe_add` function when possible.
 
+# Memory management
+
+- When a value is removed, the related partitions (and tags) may be empty, leaving both an empty array
+  in memory and a directory on the file-system. Should they be removed?
+
 # Documentation
 
 - Write the API documentation.