has automatic storage duration or is not initialized by
.Fa PTHREAD_ONCE_INIT .
.Sh RETURN VALUES
-If successful, the
+If successful, the
.Fn pthread_once
function will return zero.
-Otherwise an error number will be returned to
-indicate the error.
+Otherwise, an error number will be returned to indicate the error.
.Sh ERRORS
None.
.Sh STANDARDS