diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
index 3682e16..54dc79e 100644
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+++ b/CHANGELOG.markdown
@@ -9,6 +9,9 @@
 
 - `PopupModal`'s `new` was reworked so that it didn't take `Ui` until `build` was called. This is a breaking change if you were invoking it directly. Simply move your `ui` call to `build` or `begin`.
 
+- Upgrade to [Dear ImGui v1.81](https://github.com/ocornut/imgui/releases/tag/v1.81)
+    - `imgui::ListBox::calculate_size(items_count: ..., height_in_items: ...)` has been removed as the function backing it has been marked as obsolete. The recommended approach is to calculate the size yourself and use `.size(...)` (or use the default auto-calculated size)
+
 ## [0.7.0] - 2021-02-04
 
 - Upgrade to [Dear ImGui v1.80](https://github.com/ocornut/imgui/releases/tag/v1.80). (Note that the new table functionality is not yet supported, however)