#define INCLUDED_supported_h
extern void add_isupport(const char *, const char *(*)(const void *), const void *);
-extern void change_isupport(const char *, const char *(*)(const void *), const void *);
+extern const void *change_isupport(const char *, const char *(*)(const void *), const void *);
extern void delete_isupport(const char *);
extern void show_isupport(struct Client *);
extern void init_isupport(void);