Update docs/concepts/projects.md

Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>

docs/concepts/projects.md

@@ -279,15 +279,16 @@ use [`uvx`](../guides/tools.md) or
 
 ### Custom project environment paths
 
-The `UV_PROJECT_ENVIRONMENT` environment variable can be used to configure the path to virtual
-environments in projects. If a relative path is provided, it will be resolved relative to the
-workspace root.
+The `UV_PROJECT_ENVIRONMENT` environment variable can be used to configure the project virtual
+environment path (`.venv` by default).
 
-If an environment is not present at the given path, uv will create it.
+If a relative path is provided, it will be resolved relative to the workspace root. If an absolute
+path is provided, it will be used as-is, i.e. a child directory will not be created for the
+environment. If an environment is not present at the provided path, uv will create it.
 
 This option can be used to write to the system Python environment, though it is not recommended.
-`uv sync` will remove extraneous packages from the environment by default, which means if there are
-installed packages relevant to the operation of the system, the system may be broken.
+`uv sync` will remove extraneous packages from the environment by default and, as such, may leave
+the system in a broken state.
 
 !!! important