diff --git a/src/layout/stack.rs b/src/layout/stack.rs
index 4565657..c7b13b4 100644
--- a/src/layout/stack.rs
+++ b/src/layout/stack.rs
@@ -54,6 +54,8 @@ pub struct Stack<Msg: Clone>
 	/// Children with their alignment, margin, and extra `(x, y)` translation
 	/// applied after alignment. Drawn in order — last child is on top.
 	pub children: Vec<( Element<Msg>, HAlign, VAlign, f32, f32, f32 )>,
+	/// When `true`, [`preferred_size`](Self::preferred_size) reports the max of
+	/// children's intrinsic widths and heights instead of `(max_width, tallest)`.
 	pub fit_content: bool,
 }
 
@@ -65,6 +67,7 @@ impl<Msg: Clone> Stack<Msg>
 		Self { children: Vec::new(), fit_content: false }
 	}
 
+	/// Enable [`Self::fit_content`].
 	pub fn fit_content( mut self ) -> Self
 	{
 		self.fit_content = true;