diff --git a/lua/nvim-treesitter/config.lua b/lua/nvim-treesitter/config.lua
index f76897bc4..b3a294563 100644
--- a/lua/nvim-treesitter/config.lua
+++ b/lua/nvim-treesitter/config.lua
@@ -140,8 +140,12 @@ function M.norm_languages(languages, skip)
   languages = vim.tbl_filter(
     --- @param v string
     function(v)
-      -- TODO(lewis6991): warn of any unknown parsers?
-      return parsers[v] ~= nil
+      if parsers[v] ~= nil then
+        return true
+      else
+        require('nvim-treesitter.log').warn('skipping unsupported language: ' .. v)
+        return false
+      end
     end,
     languages
   )