diff --git a/config.vim b/config.vim
index a141e59..733e8b4 100644
--- a/config.vim
+++ b/config.vim
@@ -72,6 +72,9 @@ augroup filetypedetect
   "jinja
   autocmd BufNewFile,BufRead *.jinja2,*.j2,*.jinja,*.nunjucks,*.nunjs,*.njk set ft=jinja
 
+  "mdx
+  autocmd BufNewFile,BufRead *.mdx set filetype=markdown.mdx
+
   "tsx
   autocmd BufNewFile,BufRead *.tsx setfiletype typescript.jsx
 augroup END
diff --git a/ftdetect/polyglot.vim b/ftdetect/polyglot.vim
index cf2ef35..9b91f84 100644
--- a/ftdetect/polyglot.vim
+++ b/ftdetect/polyglot.vim
@@ -72,6 +72,9 @@ augroup filetypedetect
   "jinja
   autocmd BufNewFile,BufRead *.jinja2,*.j2,*.jinja,*.nunjucks,*.nunjs,*.njk set ft=jinja
 
+  "mdx
+  autocmd BufNewFile,BufRead *.mdx set filetype=markdown.mdx
+
   "tsx
   autocmd BufNewFile,BufRead *.tsx setfiletype typescript.jsx
 augroup END