--- Libc/Libc-391.5.22/pthreads/pthread_join.3
+++ Libc/Libc-262/pthreads/pthread_join.3
@@ -68,6 +68,8 @@
 .Fn pthread_join
 is cancelled, then the target thread is not detached.
 .Pp
+A thread that has exited but remains unjoined counts against
+[_POSIX_THREAD_THREADS_MAX].
 .Sh RETURN VALUES
 If successful,  the
 .Fn pthread_join