--- Libc/Libc-320/pthreads/pthread_cleanup_push.3
+++ Libc/Libc-583/pthreads/pthread_cleanup_push.3
@@ -36,20 +36,27 @@
 .Sh SYNOPSIS
 .Fd #include <pthread.h>
 .Ft void
-.Fn pthread_cleanup_push "void \*[lp]*cleanup_routine\*[rp]\*[lp]void *\*[rp]" "void *arg"
+.Fo pthread_cleanup_push
+.Fa "void \*[lp]*routine\*[rp]\*[lp]void *\*[rp]"
+.Fa "void *arg"
+.Fc
 .Sh DESCRIPTION
 The
 .Fn pthread_cleanup_push
 function adds
-.Fa cleanup_routine
+.Fa routine
 to the top of the stack of cleanup handlers that
 get called when the current thread exits.
 .Pp
 When
-.Fa cleanup_routine
+.Fa routine
 is called, it is passed
 .Fa arg
 as its only argument.
+.Fn pthread_cleanup_push
+must be paired with a corresponding 
+.Xr pthread_cleanup_pop 3 
+in the same lexical scope.
 .Sh RETURN VALUES
 .Fn pthread_cleanup_push
 does not return any value.