diff --git a/ftplugin/fsharp.vim b/ftplugin/fsharp.vim
index 745470d..2e266b1 100644
--- a/ftplugin/fsharp.vim
+++ b/ftplugin/fsharp.vim
@@ -1 +1,24 @@
-" Dummy file to shutup logging
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+setlocal comments=:///,://!,://
+setlocal commentstring=//%s
+setlocal formatoptions-=t formatoptions+=croqnl
+" j was only added in 7.3.541, so stop complaints about its nonexistence
+silent! setlocal formatoptions+=j
+
+" smartindent will be overridden by indentexpr if filetype indent is on, but
+" otherwise it's better than nothing.
+setlocal smartindent nocindent
+
+setlocal suffixesadd=.fs
+
+let b:undo_ftplugin = "setlocal formatoptions< comments< commentstring< suffixesadd<"
+
+let &cpo = s:save_cpo
+unlet s:save_cpo