diff --git a/wip/stacked-borrows.md b/wip/stacked-borrows.md
index f1c9d1fd..a5cb1b12 100644
--- a/wip/stacked-borrows.md
+++ b/wip/stacked-borrows.md
@@ -72,7 +72,7 @@ pub struct Stack {
 }
 
 /// Extra per-call-frame state: the ID of this function call.
-pub struct FrameExtre {
+pub struct FrameExtra {
     id: CallId,
 }