rcl_wait_set_add_subscription() allocates memory???

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Hi all,

Seeing https://github.com/ros2/rcl/blob/gala..., it explains that rcl_wait_set_add_subscription() allocates memory.

 * Allocates Memory   | Yes
 * Thread-Safe        | No
 * Uses Atomics       | No
 * Lock-Free          | Yes
 *
....
 */
RCL_PUBLIC
RCL_WARN_UNUSED
rcl_ret_t
rcl_wait_set_add_subscription(
  rcl_wait_set_t * wait_set,
  const rcl_subscription_t * subscription,
  size_t * index);

I tried to find out where memory allocation happens from:

• https://github.com/ros2/rcl/blob/gala...
• https://github.com/ros2/rcl/blob/gala...

, but it doesn't look like any new memory allocation happens.

Maybe the documentation is wrong?

Thanks, Sean