diff --git a/README.md b/README.md
index 80846ef..a220adc 100644
--- a/README.md
+++ b/README.md
@@ -199,7 +199,7 @@ local config = {
     - A custom function that returns a window number and optionally a buffer.
 
   - `Flatten.OpenContext`:
-    - `files`: `string[]`
+    - `files`: `Flatten.BufInfo[]`
       - The list of files passed to the host.
     - `argv`: `string[]`
       - The full argv list from the *guest* instance.
diff --git a/lua/flatten/core.lua b/lua/flatten/core.lua
index e7388d3..3082beb 100644
--- a/lua/flatten/core.lua
+++ b/lua/flatten/core.lua
@@ -279,7 +279,7 @@ function M.edit_files(opts)
     winnr = winnr or vim.api.nvim_get_current_win()
     bufnr = bufnr or vim.api.nvim_get_current_buf()
   elseif type(open) == "function" then
-    bufnr, winnr = open({
+    winnr, bufnr = open({
       files = files,
       argv = argv,
       stdin_buf = stdin_buf,