diff --git a/libc/bionic/fork.cpp b/libc/bionic/fork.cpp
index d432c6d..615e81f 100644
--- a/libc/bionic/fork.cpp
+++ b/libc/bionic/fork.cpp
@@ -50,11 +50,13 @@
   return result;
 }
 
+int _Fork() {
+  return __clone_for_fork();
+}
+
 int fork() {
   __bionic_atfork_run_prepare();
-
-  int result = __clone_for_fork();
-
+  int result = _Fork();
   if (result == 0) {
     // Disable fdsan and fdtrack post-fork, so we don't falsely trigger on processes that
     // fork, close all of their fds, and then exec.
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index c8cceb2..b94197e 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -78,8 +78,37 @@
 
 __noreturn void _exit(int __status);
 
-pid_t  fork(void);
-pid_t  vfork(void) __returns_twice;
+/**
+ * [fork(2)](http://man7.org/linux/man-pages/man2/fork.2.html) creates a new
+ * process. fork() runs any handlers set by pthread_atfork().
+ *
+ * Returns 0 in the child, the pid of the child in the parent,
+ * and returns -1 and sets `errno` on failure.
+ */
+pid_t fork(void);
+
+/**
+ * _Fork() creates a new process. _Fork() differs from fork() in that it does
+ * not run any handlers set by pthread_atfork().
+ *
+ * Returns 0 in the child, the pid of the child in the parent,
+ * and returns -1 and sets `errno` on failure.
+ *
+ * Available since API level 35.
+ */
+pid_t _Fork(void) __INTRODUCED_IN(35);
+
+/**
+ * [vfork(2)](http://man7.org/linux/man-pages/man2/vfork.2.html) creates a new
+ * process. vfork() differs from fork() in that it does not run any handlers
+ * set by pthread_atfork(), and the parent is suspended until the child calls
+ * exec() or exits.
+ *
+ * Returns 0 in the child, the pid of the child in the parent,
+ * and returns -1 and sets `errno` on failure.
+ */
+pid_t vfork(void) __returns_twice;
+
 pid_t  getpid(void);
 pid_t  gettid(void) __attribute_const__;
 pid_t  getpgid(pid_t __pid);
diff --git a/libc/libc.map.txt b/libc/libc.map.txt
index 5e9763b..2c8ec07 100644
--- a/libc/libc.map.txt
+++ b/libc/libc.map.txt
@@ -1592,6 +1592,7 @@
     android_crash_detail_replace_data;
     epoll_pwait2;
     epoll_pwait2_64;
+    _Fork;
     localtime_rz;
     mbsrtowcs_l;
     mktime_z;