diff --git a/src/proto/spell.pro b/src/proto/spell.pro
index c2b14bf..6114412 100644
--- a/src/proto/spell.pro
+++ b/src/proto/spell.pro
@@ -34,4 +34,8 @@
 int spell_word_start(int startcol);
 void spell_expand_check_cap(colnr_T col);
 int expand_spelling(linenr_T lnum, char_u *pat, char_u ***matchp);
+int valid_spellang(char_u *val);
+int valid_spellfile(char_u *val);
+char *did_set_spell_option(int is_spellfile);
+char *compile_cap_prog(synblock_T *synblock);
 /* vim: set ft=c : */