diff --git a/README.md b/README.md
index 9246529..8f0a8f1 100644
--- a/README.md
+++ b/README.md
@@ -241,6 +241,8 @@ t | Add triangle surface
 q | Add quad surface
 g | Add grid warp surface
 d | duplicate surface
+``+`` | Scale surface up
+``-`` | Scale surface down
 p | toggle perspective warping (quad surfaces only)
 ] | add columns to grid surface (grid warp surfaces only)
 [ | remove columns from grid surface (grid warp surfaces only)
@@ -248,8 +250,8 @@ p | toggle perspective warping (quad surfaces only)
 { | remove rows from grid surface (grid warp surfaces only)
 . | select next surface (projection mapping mode only)
 , | select previous surface (projection mapping mode only)
-> | select next vertex
-< | select previous vertex
+``>`` | select next vertex
+``<`` | select previous vertex
 0 | Move selected surface one layer up
 9 | Move selected surface one layer down
 s | Save composition