diff --git a/runtime/ftplugin/nroff.vim b/runtime/ftplugin/nroff.vim
index 1c6d4eb..cd2680e 100644
--- a/runtime/ftplugin/nroff.vim
+++ b/runtime/ftplugin/nroff.vim
@@ -8,6 +8,7 @@
 "	2024 May 24 by Riley Bruins <ribru17@gmail.com> ('commentstring' #14843)
 "	2025 Feb 12 by Wu, Zhenyu <wuzhenyu@ustc.edu> (matchit configuration #16619)
 "	2025 Apr 16 by Eisuke Kawashima (cpoptions #17121)
+"	2025 Apr 24 by Eisuke Kawashima (move options from syntax to ftplugin #17174)
 
 if exists("b:did_ftplugin")
   finish
@@ -22,7 +23,17 @@
 setlocal sections+=Sh
 setlocal define=.\s*de
 
-let b:undo_ftplugin = 'setlocal commentstring< comments< sections< define<'
+if get(b:, 'preprocs_as_sections')
+  setlocal sections=EQTSPS[\ G1GS
+endif
+
+let b:undo_ftplugin = 'setlocal commentstring< comments< sections& define<'
+
+if get(b:, 'nroff_is_groff')
+  " groff_ms exdented paragraphs are not in the default paragraphs list.
+  setlocal paragraphs+=XP
+  let b:undo_ftplugin .= ' paragraphs&'
+endif
 
 if exists('loaded_matchit')
   let b:match_words = '^\.\s*ie\>:^\.\s*el\>'