diff --git a/libc/include/sys/resource.h b/libc/include/sys/resource.h
index 7c43ca3..9181125 100644
--- a/libc/include/sys/resource.h
+++ b/libc/include/sys/resource.h
@@ -42,21 +42,20 @@
 
 typedef unsigned long rlim_t;
 
-int getrlimit(int, struct rlimit*);
-int setrlimit(int, const struct rlimit*);
+int getrlimit(int __resource, struct rlimit* __limit);
+int setrlimit(int __resource, const struct rlimit* __limit);
 
-int getrlimit64(int, struct rlimit64*) __INTRODUCED_IN(21);
-int setrlimit64(int, const struct rlimit64*) __INTRODUCED_IN(21);
+int getrlimit64(int __resource, struct rlimit64* __limit) __INTRODUCED_IN(21);
+int setrlimit64(int __resource, const struct rlimit64* __limit) __INTRODUCED_IN(21);
 
-int getpriority(int, id_t);
-int setpriority(int, id_t, int);
+int getpriority(int __which, id_t __who);
+int setpriority(int __which, id_t __who, int __priority);
 
-int getrusage(int, struct rusage*);
+int getrusage(int __who, struct rusage* __usage);
 
-int prlimit(pid_t, int, const struct rlimit*, struct rlimit*) __INTRODUCED_IN_32(24)
-  __INTRODUCED_IN_64(21);
-int prlimit64(pid_t, int, const struct rlimit64*, struct rlimit64*) __INTRODUCED_IN(21);
+int prlimit(pid_t __pid, int __resource, const struct rlimit* __new_limit, struct rlimit* __old_limit) __INTRODUCED_IN_32(24) __INTRODUCED_IN_64(21);
+int prlimit64(pid_t __pid, int __resource, const struct rlimit64* __new_limit, struct rlimit64* __old_limit) __INTRODUCED_IN(21);
 
 __END_DECLS
 
-#endif /* _SYS_RESOURCE_H_ */
+#endif