diff --git a/lua/oil/config.lua b/lua/oil/config.lua
index 3ed851e..562562c 100644
--- a/lua/oil/config.lua
+++ b/lua/oil/config.lua
@@ -394,6 +394,13 @@ local M = {}
 M.setup = function(opts)
   opts = opts or {}
 
+  if opts.trash_command then
+    vim.notify(
+      "[oil.nvim] trash_command is deprecated. Use built-in trash functionality instead (:help oil-trash).\nCompatibility will be removed on 2025-06-01.",
+      vim.log.levels.WARN
+    )
+  end
+
   local new_conf = vim.tbl_deep_extend("keep", opts, default_config)
   if not new_conf.use_default_keymaps then
     new_conf.keymaps = opts.keymaps or {}