diff --git a/include/types/fd.h b/include/types/fd.h
index 2e350b8..c6e47f2 100644
--- a/include/types/fd.h
+++ b/include/types/fd.h
@@ -100,6 +100,7 @@
 	int  REGPRM2 (*is_set)(const int fd, int dir);       /* check if <fd> is being polled for dir <dir> */
 	void REGPRM2    (*set)(const int fd, int dir);       /* set   polling on <fd> for <dir> */
 	void REGPRM2    (*clr)(const int fd, int dir);       /* clear polling on <fd> for <dir> */
+	void REGPRM2    (*wai)(const int fd, int dir);       /* wait for polling on <fd> for <dir> */
 	void REGPRM1    (*rem)(const int fd);                /* remove any polling on <fd> */
 	void REGPRM1    (*clo)(const int fd);                /* mark <fd> as closed */
     	void REGPRM2   (*poll)(struct poller *p, int exp);   /* the poller itself */