diff --git a/.github/workflows/python-nightly.yml b/.github/workflows/python-nightly.yml
index da8dc953d..13c347350 100644
--- a/.github/workflows/python-nightly.yml
+++ b/.github/workflows/python-nightly.yml
@@ -37,6 +37,8 @@ jobs:
     # because jammy ships 3.10, and deadsnakes doesn't want to clobber it.
     # https://launchpad.net/~deadsnakes/+archive/ubuntu/nightly/+packages
     # https://github.com/deadsnakes/issues/issues/234
+    # See https://github.com/deadsnakes/nightly for the source of the nightly
+    # builds.
     # bionic: 18, focal: 20, jammy: 22, noble: 24
     runs-on: ubuntu-22.04
     # If it doesn't finish in an hour, it's not going to. Don't spin for six