diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2aa6444..c1da9d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@
 
 - Improve syntax highlighting for escaped backticks in interpolated strings ([#55](https://github.com/rescript-lang/vim-rescript/pull/55))
 - Highlight improvements ([#69](https://github.com/rescript-lang/vim-rescript/pull/69))
+- Support `commentstring`. https://github.com/rescript-lang/vim-rescript/pull/76
 
 ## 2.1.0
 
diff --git a/ftplugin/rescript.vim b/ftplugin/rescript.vim
new file mode 100644
index 0000000..9cb4ab3
--- /dev/null
+++ b/ftplugin/rescript.vim
@@ -0,0 +1 @@
+setlocal commentstring=//\ %s