Update stack-settings.md

docs/concepts/stack/stack-settings.md

@@ -226,7 +226,7 @@ List of the most useful labels:
 
 ### Project root
 
-Project root points to the directory within the repo where the project should start executing. This is especially useful for monorepos, or indeed repositories hosting multiple somewhat independent projects. This setting plays very well with [Git push policies](../policy/push-policy/README.md), allowing you to easily express generic rules on what it means for the stack to be affected by a code change.
+Project root points to the directory within the repo where the project should start executing. This is especially useful for monorepos, or indeed repositories hosting multiple somewhat independent projects. This setting plays very well with [Git push policies](../policy/push-policy/README.md), allowing you to easily express generic rules on what it means for the stack to be affected by a code change. In the absence of push policies, any changes made to the project root and any paths specified by project globs will trigger Spacelift runs.
 
 !!! info
     The project root can be overridden by the [runtime configuration](../configuration/runtime-configuration/README.md#project_root-setting) specified in the `.spacelift/config.yml` file.