diff --git a/src/proto/charset.pro b/src/proto/charset.pro
index a3d4c14..dc33f65 100644
--- a/src/proto/charset.pro
+++ b/src/proto/charset.pro
@@ -21,7 +21,12 @@
 int vim_iswordp __ARGS((char_u *p));
 int vim_iswordc_buf __ARGS((char_u *p, buf_T *buf));
 void init_spell_chartab __ARGS((void));
+int set_spell_chartab __ARGS((char_u *fol, char_u *low, char_u *upp));
+int set_spell_charflags __ARGS((char_u *flags, int cnt, char_u *upp));
+void write_spell_chartab __ARGS((FILE *fd));
 int spell_iswordc __ARGS((char_u *p));
+int spell_isupper __ARGS((int c));
+int spell_casefold __ARGS((char_u *p, int len, char_u *buf, int buflen));
 int vim_isfilec __ARGS((int c));
 int vim_isprintc __ARGS((int c));
 int vim_isprintc_strict __ARGS((int c));