Add details to basic usage docs about setting `VIRTUAL_ENV_DISABLE_PROMPT` (#7874)

docs/basic-usage.md

@@ -149,6 +149,9 @@ Therefore, Poetry has to create a sub-shell with the virtual environment activat
 in order for the subsequent commands to run from within the virtual environment.
 in order for the subsequent commands to run from within the virtual environment.
 {{% /note %}}
 {{% /note %}}
 
 
+If you'd like to prevent `poetry shell` from modifying your shell prompt on virtual environment activation, you should
+set `VIRTUAL_ENV_DISABLE_PROMPT=1` as an environment variable before running the command.
+
 Alternatively, to avoid creating a new shell, you can manually activate the
 Alternatively, to avoid creating a new shell, you can manually activate the
 virtual environment by running `source {path_to_venv}/bin/activate` (`{path_to_venv}\Scripts\activate.ps1` in PowerShell).
 virtual environment by running `source {path_to_venv}/bin/activate` (`{path_to_venv}\Scripts\activate.ps1` in PowerShell).
 To get the path to your virtual environment run `poetry env info --path`.
 To get the path to your virtual environment run `poetry env info --path`.