diff --git a/module/common/nvim/key/Common.lua b/module/common/nvim/key/Common.lua
index 06452016..2e8ff04d 100644
--- a/module/common/nvim/key/Common.lua
+++ b/module/common/nvim/key/Common.lua
@@ -4,6 +4,24 @@ function bye()
 	vim.cmd[[qa!]]
 end
 
+function toggle_tab_width()
+	if vim.bo.shiftwidth == 2 then
+		vim.bo.shiftwidth  = 4
+		vim.bo.tabstop     = 4
+		vim.bo.softtabstop = 4
+	elseif vim.bo.shiftwidth == 4 then
+		vim.bo.shiftwidth  = 8
+		vim.bo.tabstop     = 8
+		vim.bo.softtabstop = 8
+	elseif vim.bo.shiftwidth == 8 then
+		vim.bo.shiftwidth  = 2
+		vim.bo.tabstop     = 2
+		vim.bo.softtabstop = 2
+	end
+end
+
+rekey_normal("<Leader>'", "<cmd>lua toggle_tab_width()<cr>")
+
 -- Repeat previous command.
 rekey_normal("<Leader>.", "@:")
 rekey_visual("<Leader>.", "@:")