Link to src-layout vs flat-layout discussion

Author: chrysle

source/discussions/src-layout-vs-flat-layout.rst

@@ -1,3 +1,5 @@
+.. _src-layout-vs-flat-layout:
+
 =========================
 src layout vs flat layout
 =========================

source/guides/packaging-namespace-packages.rst

@@ -95,9 +95,9 @@ package omits the :file:`__init__.py` or uses a pkgutil-style
 logic to fail and the other sub-packages will not be importable.
 
 The ``src-layout`` directory structure allows automatic discovery of packages
-by most :term:`build backends <Build Backend>`. If however you want to manage
-exclusions or inclusions of packages yourself, this is possible to be configured
-in the top-level :file:`pyproject.toml`:
+by most :term:`build backends <Build Backend>`. See :ref:`src-layout-vs-flat-layout`
+for more information. If however you want to manage exclusions or inclusions of packages 
+yourself, this is possible to be configured in the top-level :file:`pyproject.toml`:
 
 .. code-block:: toml