diff --git a/docs/basics.rst b/docs/basics.rst
index 5bb0cf7f..78ac66c1 100644
--- a/docs/basics.rst
+++ b/docs/basics.rst
@@ -245,6 +245,9 @@ the current working directory when working on packages::
 
 Note that all sub-dependencies will get added to the ``Pipfile.lock`` as well.
 
+.. note:: Sub-dependencies are **not** added to the ``Pipfile.lock`` if you
+          leave the ``-e`` option out.
+
 
 .. _environment_management: