diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index ef75c84..f191028 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -98,7 +98,7 @@
 int execlp(const char* __file, const char* __arg0, ...) __attribute__((__sentinel__));
 int execle(const char* __path, const char* __arg0, ... /*,  char* const* __envp */)
     __attribute__((__sentinel__(1)));
-int fexecve(int __fd, char* const* __argv, char* const* __envp) __INTRODUCED_IN_FUTURE;
+int fexecve(int __fd, char* const* __argv, char* const* __envp) __INTRODUCED_IN(28);
 
 int nice(int __incr);
 
@@ -119,7 +119,7 @@
 int getresuid(uid_t* __ruid, uid_t* __euid, uid_t* __suid);
 int getresgid(gid_t* __rgid, gid_t* __egid, gid_t* __sgid);
 char* getlogin(void);
-int getlogin_r(char* __buffer, size_t __buffer_size) __INTRODUCED_IN_FUTURE;
+int getlogin_r(char* __buffer, size_t __buffer_size) __INTRODUCED_IN(28);
 
 long fpathconf(int __fd, int __name);
 long pathconf(const char* __path, int __name);
@@ -152,7 +152,7 @@
 
 void sync(void);
 #if defined(__USE_GNU)
-int syncfs(int __fd) __INTRODUCED_IN_FUTURE;
+int syncfs(int __fd) __INTRODUCED_IN(28);
 #endif
 
 int close(int __fd);
@@ -243,7 +243,7 @@
 int getdomainname(char* __buf, size_t __buf_size) __INTRODUCED_IN(26);
 int setdomainname(const char* __name, size_t __n) __INTRODUCED_IN(26);
 
-void swab(const void* __src, void* __dst, ssize_t __byte_count) __INTRODUCED_IN_FUTURE;
+void swab(const void* __src, void* __dst, ssize_t __byte_count) __INTRODUCED_IN(28);
 
 #if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
 #include <bits/fortify/unistd.h>
@@ -251,4 +251,4 @@
 
 __END_DECLS
 
-#endif /* _UNISTD_H_ */
+#endif