diff --git a/lua/which-key/layout.lua b/lua/which-key/layout.lua
index ee9b1feb..b8c1a792 100644
--- a/lua/which-key/layout.lua
+++ b/lua/which-key/layout.lua
@@ -7,7 +7,7 @@ local dw = vim.fn.strdisplaywidth
 --- Otherwise, it is a percentage of `parent` (relative size).
 --- If `size` is negative, it is subtracted from `parent`.
 --- If `size` is a table, it is a range of values.
----@alias wk.Dim number|{min:number, max:number}
+---@alias wk.Dim number|{min:number, max:number}|function
 
 ---@param size number
 ---@param parent number
@@ -17,6 +17,9 @@ function M.dim(size, parent, ...)
   size = math.abs(size) < 1 and parent * size or size
   size = size < 0 and parent + size or size
   for _, dim in ipairs({ ... } --[[ @as wk.Dim[] ]]) do
+    if type(dim) == "function" then
+      dim = dim()
+    end
     if type(dim) == "number" then
       size = M.dim(dim, parent)
     else
diff --git a/lua/which-key/win.lua b/lua/which-key/win.lua
index 5a1ccf9c..d68b3e3d 100644
--- a/lua/which-key/win.lua
+++ b/lua/which-key/win.lua
@@ -9,7 +9,6 @@ M.__index = M
 
 ---@class wk.Win.opts
 local override = {
-  relative = "editor",
   style = "minimal",
   focusable = false,
   noautocmd = true,
@@ -29,7 +28,12 @@ local override = {
 }
 
 ---@type wk.Win.opts
-local defaults = { col = 0, row = math.huge, zindex = 1000 }
+local defaults = {
+  relative = "editor",
+  col = 0,
+  row = math.huge,
+  zindex = 1000
+}
 
 ---@param opts? wk.Win.opts
 function M.defaults(opts)