diff --git a/jaraco/envs.py b/jaraco/envs.py
index 4b0f90a..e8f972e 100644
--- a/jaraco/envs.py
+++ b/jaraco/envs.py
@@ -8,6 +8,19 @@
 
 
 class VirtualEnv:
+    """
+    >>> mp = getfixture('monkeypatch')
+    >>> root = getfixture('tmp_path')
+    >>> mp.setenv('SERVICES_ROOT', str(root))
+
+    Subclass VirtualEnv and supply name and req:
+
+    >>> class MyVirtualEnv(VirtualEnv):
+    ...     name = '.venv'
+    ...     req = 'example'
+    >>> env = MyVirtualEnv().create()
+    """
+
     root = Path(os.environ.get('SERVICES_ROOT', '.cache/services'))
     clean_opts = ["--no-setuptools", "--no-pip", "--no-wheel"]