diff --git a/libc/include/sys/epoll.h b/libc/include/sys/epoll.h
index fcdab43..6ecd93f 100644
--- a/libc/include/sys/epoll.h
+++ b/libc/include/sys/epoll.h
@@ -53,8 +53,8 @@
 #endif
 ;
 
-int epoll_create(int);
-int epoll_create1(int) __INTRODUCED_IN(21);
+int epoll_create(int __size);
+int epoll_create1(int __flags) __INTRODUCED_IN(21);
 
 /*
  * Some third-party code uses the existence of EPOLL_CLOEXEC to detect the
@@ -71,10 +71,10 @@
 #undef EPOLL_CLOEXEC
 #endif
 
-int epoll_ctl(int, int, int, struct epoll_event*);
-int epoll_wait(int, struct epoll_event*, int, int);
-int epoll_pwait(int, struct epoll_event*, int, int, const sigset_t*) __INTRODUCED_IN(21);
+int epoll_ctl(int __epoll_fd, int __op, int __fd, struct epoll_event* __event);
+int epoll_wait(int __epoll_fd, struct epoll_event* __events, int __event_count, int __timeout_ms);
+int epoll_pwait(int __epoll_fd, struct epoll_event* __events, int __event_count, int __timeout_ms, const sigset_t* __mask) __INTRODUCED_IN(21);
 
 __END_DECLS
 
-#endif  /* _SYS_EPOLL_H_ */
+#endif