doc: document the "*" filetype option

1 files changed, 4 insertions, 0 deletions

diff --git a/README.md b/README.md
index 66b50dc..72514ef 100644
--- a/README.md
+++ b/README.md
@@ -214,6 +214,10 @@ require("conform").setup({
     python = { "isort", "black" },
     -- Use a sub-list to run only the first available formatter
     javascript = { { "prettierd", "prettier" } },
+    -- Use the "*" filetype to run formatters on all files.
+    -- Note that if you use this, you may want to set lsp_fallback = "always"
+    -- (see :help conform.format)
+    ["*"] = { "trim_whitespace" },
   },
   -- If this is set, Conform will run the formatter on save.
   -- It will pass the table to conform.format().