Improve ExpansionTile docs (#11034)

1b20dbc6 · Collin Jackson · GitHub · 5f20f834 · 1b20dbc6
Commit 1b20dbc6 authored Jul 05, 2017 by Collin Jackson Committed by GitHub Jul 05, 2017
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expansion_tile.dart packages/flutter/lib/src/material/expansion_tile.dart +3 -2

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--- a/packages/flutter/lib/src/material/expansion_tile.dart
+++ b/packages/flutter/lib/src/material/expansion_tile.dart
@@ -18,8 +18,9 @@ const Duration _kExpand = const Duration(milliseconds: 200);
 ///
 /// This widget is typically used with [ListView] to create an
 /// "expand / collapse" list entry. When used with scrolling widgets like
-/// [ListView], a unique [key] must be specified to enable the [ExpansionTile] to
-/// save and restore its expanded state when it is scrolled in and out of view.
+/// [ListView], a unique [PageStorageKey] must be specified to enable the
+/// [ExpansionTile] to save and restore its expanded state when it is scrolled
+/// in and out of view.
 ///
 /// See also:
 ///