diff --git a/README.md b/README.md
index a5215ce..cc1feb4 100644
--- a/README.md
+++ b/README.md
@@ -182,8 +182,8 @@ q | Add quad surface
 x | Add quad surface
 g | Add grid warp surface
 a | duplicate selected surface
-\+ | Scale surface up
-\- | Scale surface down
+o | Scale surface up
+i | Scale surface down
 p | toggle perspective warping (quad surfaces only)
 v | add columns to grid surface (grid warp surfaces only)
 b | remove columns from grid surface (grid warp surfaces only)