diff --git a/libc/include/sys/resource.h b/libc/include/sys/resource.h
index 8209dfb..74e903f 100644
--- a/libc/include/sys/resource.h
+++ b/libc/include/sys/resource.h
@@ -45,16 +45,16 @@
 extern int getrlimit(int, struct rlimit*);
 extern int setrlimit(int, const struct rlimit*);
 
-extern int getrlimit64(int, struct rlimit64*);
-extern int setrlimit64(int, const struct rlimit64*);
+extern int getrlimit64(int, struct rlimit64*) __INTRODUCED_IN(21);
+extern int setrlimit64(int, const struct rlimit64*) __INTRODUCED_IN(21);
 
 extern int getpriority(int, int);
 extern int setpriority(int, int, int);
 
 extern int getrusage(int, struct rusage*);
 
-extern int prlimit(pid_t, int, const struct rlimit*, struct rlimit*);
-extern int prlimit64(pid_t, int, const struct rlimit64*, struct rlimit64*);
+extern int prlimit(pid_t, int, const struct rlimit*, struct rlimit*) __INTRODUCED_IN(24);
+extern int prlimit64(pid_t, int, const struct rlimit64*, struct rlimit64*) __INTRODUCED_IN(21);
 
 __END_DECLS