diff --git a/src/proto/buffer.pro b/src/proto/buffer.pro
index 131ac82..0a7a616 100644
--- a/src/proto/buffer.pro
+++ b/src/proto/buffer.pro
@@ -69,17 +69,22 @@
 void switch_to_win_for_buf(buf_T *buf, win_T **save_curwinp, tabpage_T **save_curtabp, bufref_T *save_curbuf);
 void restore_win_for_buf(win_T *save_curwin, tabpage_T *save_curtab, bufref_T *save_curbuf);
 int find_win_for_buf(buf_T *buf, win_T **wp, tabpage_T **tp);
-void buf_addsign(buf_T *buf, int id, linenr_T lnum, int typenr);
-linenr_T buf_change_sign_type(buf_T *buf, int markId, int typenr);
+void buf_addsign(buf_T *buf, int id, char_u *group, int prio, linenr_T lnum, int typenr);
+linenr_T buf_change_sign_type(buf_T *buf, int markId, char_u *group, int typenr);
 int buf_getsigntype(buf_T *buf, linenr_T lnum, int type);
-linenr_T buf_delsign(buf_T *buf, int id);
-int buf_findsign(buf_T *buf, int id);
+linenr_T buf_delsign(buf_T *buf, int id, char_u *group);
+int buf_findsign(buf_T *buf, int id, char_u *group);
+#ifdef FEAT_SIGNS
+int sign_in_group(signlist_T *sign, char_u *group);
+dict_T *sign_get_info(signlist_T *sign);
+signlist_T *buf_getsign_with_id(buf_T *buf, int id, char_u *group);
+#endif
 int buf_findsign_id(buf_T *buf, linenr_T lnum);
 int buf_findsigntype_id(buf_T *buf, linenr_T lnum, int typenr);
 int buf_signcount(buf_T *buf, linenr_T lnum);
-void buf_delete_signs(buf_T *buf);
+void buf_delete_signs(buf_T *buf, char_u *group);
 void buf_delete_all_signs(void);
-void sign_list_placed(buf_T *rbuf);
+void sign_list_placed(buf_T *rbuf, char_u *sign_group);
 void sign_mark_adjust(linenr_T line1, linenr_T line2, long amount, long amount_after);
 void set_buflisted(int on);
 int buf_contents_changed(buf_T *buf);