diff --git a/pep-0470.txt b/pep-0470.txt
index dd9d4e561..ce6557256 100644
--- a/pep-0470.txt
+++ b/pep-0470.txt
@@ -313,7 +313,9 @@ Projects Which Rely on Externally Hosted files
 
 This is determined by crawling the simple index and looking for installable
 files using a similar detection method as pip and setuptools use. The "latest"
-version is determined using ``pkg_resources.parse_version`` sort order.
+version is determined using ``pkg_resources.parse_version`` sort order and it
+is used to show whether or not the latest version is hosted externally or only
+old versions are.
 
 ============ ======= ================ =================== =======
 \             PyPI    External (old)   External (latest)   Total