diff --git a/Docs/articles/ui.md b/Docs/articles/ui.md
index 323e9cc..cdbabc6 100644
--- a/Docs/articles/ui.md
+++ b/Docs/articles/ui.md
@@ -91,3 +91,4 @@ this.UiSystem.Add("InfoBox", box);
 Note that, when setting the width and height of any element, there are some things to note:
 - Each element has a `SetWidthBasedOnChildren` and a `SetHeightBasedOnChildren` property, which allow them to change their size automatically based on their content
 - When specifying a width or height *lower than or equal to 1*, it is seen as a percentage based on the parent's size instead. For example, a paragraph with a width of `0.5F` inside of a panel width a width of `200` will be `100` units wide.
+- When specifying a width *lower than 0*, it is seen as a percentage based on the element's height, and vice versa. For example, a panel with a width of `200` and a height of `-2` will be `400` units tall.
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