diff --git a/.config/nvim/lua/config/cmp.lua b/.config/nvim/lua/config/cmp.lua
index 86308af..c5fbc53 100644
--- a/.config/nvim/lua/config/cmp.lua
+++ b/.config/nvim/lua/config/cmp.lua
@@ -25,6 +25,7 @@ cmp.setup({
     end,
   },
   -- switch on rounded borders in floating completion windows
+  -- additionally vim.o.winborder = 'rounded' must be set (set.lua)
   window = {
     completion = cmp.config.window.bordered(),
     documentation = cmp.config.window.bordered(),
diff --git a/.config/nvim/lua/config/set.lua b/.config/nvim/lua/config/set.lua
index 3103e8c..b247a5a 100644
--- a/.config/nvim/lua/config/set.lua
+++ b/.config/nvim/lua/config/set.lua
@@ -18,3 +18,5 @@ vim.diagnostic.config({
 })
 
 vim.opt.undofile = true
+
+vim.o.winborder = 'rounded'