diff --git a/backends/x/window.go b/backends/x/window.go
index 18dea52..83eac7a 100644
--- a/backends/x/window.go
+++ b/backends/x/window.go
@@ -203,7 +203,7 @@ func (window *Window) redrawChildEntirely () {
 
 func (window *Window) resizeChildToFit () {
 	window.skipChildDrawCallback = true
-	if child, ok := window.child.(tomo.Expanding); ok {
+	if child, ok := window.child.(tomo.Flexible); ok {
 		minimumHeight := child.MinimumHeightFor(window.metrics.width)
 		_, minimumWidth := child.MinimumSize()
 		
diff --git a/element.go b/element.go
index 2bb31d9..6194e70 100644
--- a/element.go
+++ b/element.go
@@ -183,9 +183,9 @@ type MouseTarget interface {
 	HandleScroll (x, y int, deltaX, deltaY float64)
 }
 
-// Expanding represents an element who's preferred minimum height can change in
+// Flexible represents an element who's preferred minimum height can change in
 // response to its width.
-type Expanding interface {
+type Flexible interface {
 	Element
 
 	// HeightForWidth returns what the element's minimum height would be if
@@ -200,6 +200,6 @@ type Expanding interface {
 	// minimum size that the element may be resized to.
 	//
 	// It is important to note that if a parent container checks for
-	// expanding chilren, it itself will likely need to be expanding.
+	// flexible chilren, it itself will likely need to be flexible.
 	MinimumHeightFor (width int) (height int)
 }
diff --git a/layouts/vertical.go b/layouts/vertical.go
index c366419..b9dabd4 100644
--- a/layouts/vertical.go
+++ b/layouts/vertical.go
@@ -25,6 +25,10 @@ func (layout Vertical) Arrange (entries []tomo.LayoutEntry, width, height int) {
 	freeSpace := height
 	expandingElements := 0
 
+	// TODO: find the width first, then store the minumum height of
+	// everything in a list, then arrange everything.
+	// minimumHeights := make([]int, len(entries))
+
 	// count the number of expanding elements and the amount of free space
 	// for them to collectively occupy
 	for index, entry := range entries {