# Possible typo in Mastering CMake - Policies section

**URL:** https://discourse.cmake.org/t/possible-typo-in-mastering-cmake-policies-section/14972
**Category:** Usage
**Created:** [August 8, 2025, 1:59am UTC](https://discourse.cmake.org/t/possible-typo-in-mastering-cmake-policies-section/14972 "2025-08-08T01:59:29Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![james-advatek](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/j/f4b2a3/32.png) [@james-advatek](https://discourse.cmake.org/u/james-advatek)
#### Post date: [August 8, 2025, 1:59am UTC](https://discourse.cmake.org/t/possible-typo-in-mastering-cmake-policies-section/14972/1 "2025-08-08T01:59:29Z")

</div>

The [“The Policy Stack”](https://cmake.org/cmake/help/book/mastering-cmake/chapter/Policies.html#the-policy-stack) section under the Policies chapter in the Mastering CMake book refers to a command `projectS`.

I’m not sure if this is a typo, as I couldn’t find any documentation about this command.

 ![image](https://discourse.cmake.org/uploads/default/original/2X/f/f201db8b8cb40e95931c1e9304876aecdd5e9ca4.png)

---

<div class="post-metadata">

### Author: ![jtxa](https://discourse.cmake.org/user_avatar/discourse.cmake.org/jtxa/32/1535_2.png) [@jtxa](https://discourse.cmake.org/u/jtxa)
#### Post date: [August 19, 2025, 9:12pm UTC](https://discourse.cmake.org/t/possible-typo-in-mastering-cmake-policies-section/14972/2 "2025-08-19T21:12:31Z")

</div>

I guess the author pressed accidentally `<SHIFT>-S` instead of `<CTRL>-S` to save the file 😉