diff --git a/common/home-manager/emacs/default.nix b/common/home-manager/emacs/default.nix
index 8d17825..a54cff3 100644
--- a/common/home-manager/emacs/default.nix
+++ b/common/home-manager/emacs/default.nix
@@ -273,6 +273,7 @@ in {
             mode = [
               ''("README\\.md\\'" . gfm-mode)''
               ''("\\.md\\'" . markdown-mode)''
+              ''("\\.mdx\\'" . markdown-mode)''
               ''("\\.markdown\\'" . markdown-mode)''
             ];
           };