diff --git a/docs/TODO b/docs/TODO
new file mode 100644
index 0000000..6f5d897
--- /dev/null
+++ b/docs/TODO
@@ -0,0 +1,8 @@
+TODO
+
+-------------------------------------------------------------------------------
+Version v0.x.y
+
+  tmr: scaling using binary heap or hash
+
+-------------------------------------------------------------------------------