diff --git a/src/proto/digraph.pro b/src/proto/digraph.pro
index 06b3341..3b4fe87 100644
--- a/src/proto/digraph.pro
+++ b/src/proto/digraph.pro
@@ -3,8 +3,14 @@
 char_u *get_digraph_for_char(int val_arg);
 int get_digraph(int cmdline);
 int getdigraph(int char1, int char2, int meta_char);
+int check_digraph_chars_valid(int char1, int char2);
 void putdigraph(char_u *str);
 void listdigraphs(int use_headers);
+void getdigraphlist_common(int list_all, typval_T *rettv);
+void f_getdigraph(typval_T *argvars, typval_T *rettv);
+void f_getdigraphlist(typval_T *argvars, typval_T *rettv);
+void f_setdigraph(typval_T *argvars, typval_T *rettv);
+void f_setdigraphlist(typval_T *argvars, typval_T *rettv);
 char *keymap_init(void);
 void ex_loadkeymap(exarg_T *eap);
 void keymap_clear(garray_T *kmap);