diff --git a/README.md b/README.md
index cd69280..ec9499d 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,18 @@ require("lspconfig").lua_ls.setup(...)
   -- set the filetype to jsonc for settings files, so you can use comments
   -- make sure you have the jsonc treesitter parser installed!
   filetype_jsonc = true,
+  --- Returns which root_dir to pick when two are available
+  ---@param a? string First potential root_dir
+  ---@param b? string Second potential root_dir
+  ---@return string?
+  root_dir_picker = function(a, b)
+    if a and b then
+      -- return longest
+      return (#a > #b) and a or b
+    end
+
+    return a or b
+  end,
   plugins = {
     -- configures lsp clients with settings in the following order:
     -- - lua settings passed in lspconfig setup
diff --git a/doc/neoconf.nvim.txt b/doc/neoconf.nvim.txt
index 7b9dc01..8f56aeb 100644
--- a/doc/neoconf.nvim.txt
+++ b/doc/neoconf.nvim.txt
@@ -92,6 +92,18 @@ CONFIGURATION                        *neoconf.nvim-neoconf.nvim-configuration*
       -- set the filetype to jsonc for settings files, so you can use comments
       -- make sure you have the jsonc treesitter parser installed!
       filetype_jsonc = true,
+      --- Returns which root_dir to pick when two are available
+      ---@param a? string First potential root_dir
+      ---@param b? string Second potential root_dir
+      ---@return string?
+      root_dir_picker = function(a, b)
+	if a and b then
+	  -- return longest
+	  return (#a > #b) and a or b
+	end
+
+	return a or b
+      end,
       plugins = {
         -- configures lsp clients with settings in the following order:
         -- - lua settings passed in lspconfig setup
diff --git a/lua/neoconf/config.lua b/lua/neoconf/config.lua
index 37edcc8..de03e12 100644
--- a/lua/neoconf/config.lua
+++ b/lua/neoconf/config.lua
@@ -17,6 +17,18 @@ M.defaults = {
   -- set the filetype to jsonc for settings files, so you can use comments
   -- make sure you have the jsonc treesitter parser installed!
   filetype_jsonc = true,
+  --- Returns which root_dir to pick when two are available
+  ---@param a? string First potential root_dir
+  ---@param b? string Second potential root_dir
+  ---@return string?
+  root_dir_picker = function(a, b)
+    if a and b then
+      -- return longest
+      return (#a > #b) and a or b
+    end
+
+    return a or b
+  end,
   plugins = {
     -- configures lsp clients with settings in the following order:
     -- - lua settings passed in lspconfig setup
diff --git a/lua/neoconf/util.lua b/lua/neoconf/util.lua
index 96ca3d0..629f0cb 100644
--- a/lua/neoconf/util.lua
+++ b/lua/neoconf/util.lua
@@ -57,11 +57,7 @@ function M.on_config(opts)
         end
         local a = opts.root_dir(...)
 
-        if a and b then
-          -- return longest
-          return #a > #b and a or b
-        end
-        return a or b
+        return Config.options.root_dir_picker(a, b)
       end
     end
   end)