diff --git a/TODO.md b/TODO.md
index 2ed2a34..0c87ed9 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,5 +2,6 @@
 1. Port to [egui](https://github.com/emilk/egui)
     - Proper support for dynamic chart display size.
     - Don't re-render plot on mouse movement
+    - Fix interval display
 2. Multiple functions in one graph.
 3. Non `y=` functions.
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