diff --git a/examples/README.rst b/examples/README.rst
index a232f2a0..0f5306da 100644
--- a/examples/README.rst
+++ b/examples/README.rst
@@ -9,7 +9,10 @@ These examples provide necessary configuration to:
 
 The `adhoc` layout is the old and problematic layout where you can mix up the installed code
 with the source code. However, these examples will provide correct configuration even for
-the `adhoc` layout.
+the `adhoc` layout. Its coverage configuration uses ``source_pkgs = example`` to measure
+the installed package without also measuring unrelated files in the test directory.
+The ``changedir = tests`` setting is still needed to keep the source checkout out of
+Python's import path, so tests exercise the installed package.
 
 The `src` layout configuration is less complicated, have that in mind when picking a layout
 for your project.
diff --git a/examples/adhoc-layout/.coveragerc b/examples/adhoc-layout/.coveragerc
index 2d87ca04..4cdd3b07 100644
--- a/examples/adhoc-layout/.coveragerc
+++ b/examples/adhoc-layout/.coveragerc
@@ -5,9 +5,7 @@ source =
 
 [run]
 branch = true
-source =
-    example
-    .
+source_pkgs = example
 
 [report]
 precision = 2