# pxHigherPriorityTaskWoken is an optional parameter and can be set to NULL

**URL:** <https://forums.freertos.org/t/pxhigherprioritytaskwoken-is-an-optional-parameter-and-can-be-set-to-null/15465>\
**Category:** Kernel\
**Created:** [July 13, 2022, 3:51pm UTC](https://forums.freertos.org/t/pxhigherprioritytaskwoken-is-an-optional-parameter-and-can-be-set-to-null/15465 "2022-07-13T15:51:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![AndreiCherniaev](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/andreicherniaev/32/573_2.png) [@AndreiCherniaev](https://forums.freertos.org/u/AndreiCherniaev)\
**Post date:** [July 13, 2022, 3:51pm UTC](https://forums.freertos.org/t/pxhigherprioritytaskwoken-is-an-optional-parameter-and-can-be-set-to-null/15465/1 "2022-07-13T15:51:05Z")

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There is doc about [xQueueSendFromISR()](https://www.freertos.org/a00119.html)  
It contains “From FreeRTOS V7.3.0 pxHigherPriorityTaskWoken is an optional parameter and can be set to NULL.”

There is doc about [xMessageBufferSendFromISR()](https://www.freertos.org/xMessageBufferSendFromISR.html)  
It contains nothing about can I set pxHigherPriorityTaskWoken to NULL or not.

Please update doc about xMessageBufferSendFromISR().

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**Author:** ![aggarg](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/aggarg/32/4245_2.png) [@aggarg](https://forums.freertos.org/u/aggarg)\
**Post date:** [July 13, 2022, 5:16pm UTC](https://forums.freertos.org/t/pxhigherprioritytaskwoken-is-an-optional-parameter-and-can-be-set-to-null/15465/2 "2022-07-13T17:16:27Z")

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Thank you for reporting this. We will update it.