diff --git a/utils/vim/ftplugin/carbon.vim b/utils/vim/ftplugin/carbon.vim
new file mode 100644
index 000000000000..6f751d6f26dd
--- /dev/null
+++ b/utils/vim/ftplugin/carbon.vim
@@ -0,0 +1,6 @@
+" Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+" Exceptions. See /LICENSE for license information.
+" SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+setlocal commentstring=//\ %s
+setlocal comments=://