diff --git a/nvim/ftdetect/crosscode.vim b/nvim/ftdetect/crosscode.vim
new file mode 100644
index 0000000..c4d0d2b
--- /dev/null
+++ b/nvim/ftdetect/crosscode.vim
@@ -0,0 +1 @@
+au BufNewFile,BufRead *.json.patch setf json