diff --git a/README.md b/README.md
index 4ea9d9b..68873af 100644
--- a/README.md
+++ b/README.md
@@ -87,9 +87,9 @@ The layout is defined by a sequence of operations as a layout command.
 The layout editor allows users to interactively input their commands and shows the resulting layouts on screen, with the following auxiliary functions:
 
 1. `Up`/`Down`: restore to the history command
-2. `Backspace`: undo the last command. If the command is already empty, restores to the current (maybe transcoded) command of the layout.
+2. `Backspace`: undo the last command. If `Shift` is hold, restores to the current (maybe transcoded) command of the layout.
 3. `Escape`: exit the editor without saving the layout.
-4. `Enter`: when all areas are defined, hit enter will save the layout. If shift is hold, only applies the command without saving it to the history.
+4. `Enter`: when all areas are defined, hit enter will save the layout. If `Shift` is hold, only applies the command without saving it to the history.
 
 ### Layout command
 
diff --git a/editor.lua b/editor.lua
index ec9b717..53e152d 100644
--- a/editor.lua
+++ b/editor.lua
@@ -369,11 +369,18 @@ function module.create(data)
             local ok, err = pcall(
                function ()
                   if key == "BackSpace" then
-                      if #current_cmd > 0 then
-                          set_cmd(current_cmd:sub(1, #current_cmd - 1))
-                      elseif embed_args == nil then
+                      local alt = false
+                      for _, m in ipairs(mod) do
+                          if m == "Shift" then
+                              alt = true
+                              break
+                          end
+                      end
+                      if alt then
                           local areas = layout.machi_get_areas(screen, tag)
                           set_cmd(machi_engine.areas_to_command(areas))
+                      else
+                          set_cmd(current_cmd:sub(1, #current_cmd - 1))
                       end
                   elseif key == "Escape" then
                      table.remove(data.cmds, #data.cmds)