diff --git a/README.md b/README.md
index 1d8f5aa..0c154db 100644
--- a/README.md
+++ b/README.md
@@ -434,6 +434,12 @@ Programatic API
 
 You can use the following APIs.
 
+#### `cmp.visible()`
+
+Return the completion menu is visible or not.
+
+NOTE: This method returns true if the native popup menu is visible. For convenience to define mappings.
+
 #### `cmp.confirm({ select = boolean, behavior = cmp.ConfirmBehavior.{Insert,Replace} })`
 
 Confirm current selected item if possible.
diff --git a/lua/cmp/utils/window.lua b/lua/cmp/utils/window.lua
index 6f87ce4..c612748 100644
--- a/lua/cmp/utils/window.lua
+++ b/lua/cmp/utils/window.lua
@@ -258,7 +258,7 @@ window.get_content_height = function(self)
   }, function()
     local height = 0
     for _, text in ipairs(vim.api.nvim_buf_get_lines(self.buf, 0, -1, false)) do
-      height = height + math.ceil(math.max(1, vim.fn.strdisplaywidth(text)) / self.style.width)
+      height = height + math.ceil(math.max(1, vim.str_utfindex(text)) / self.style.width)
     end
     return height
   end)