Explain how -e affects pip freeze.
@@ -325,6 +325,9 @@ the :ref:`--editable <install_--editable>` option) or not.
already installed, the VCS source will not overwrite it without an `--upgrade`
flag. VCS requirements pin the package version (specified in the `setup.py`
file) of the target commit, not necessarily the commit itself.
+* The :ref:`pip freeze` subcomand will record the VCS requirement specifier
+ (referencing a specific commit) if and only if the install is done using the
+ editable option.
The "project name" component of the url suffix "egg=<project name>-<version>"
is used by pip in its dependency logic to identify the project prior
