diff --git a/Lib/test/site-packages/README.txt b/Lib/test/site-packages/README.txt
new file mode 100644
index 000000000..273f6251a
--- /dev/null
+++ b/Lib/test/site-packages/README.txt
@@ -0,0 +1,2 @@
+This directory exists so that 3rd party packages can be installed
+here.  Read the source for site.py for more details.