diff --git a/.github/workflows/production-suite.yml b/.github/workflows/production-suite.yml
index b9d351406f..74c9df1a5a 100644
--- a/.github/workflows/production-suite.yml
+++ b/.github/workflows/production-suite.yml
@@ -110,6 +110,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          # Base images are built using `tools/ci/Dockerfile.template`.
+          # The comments at the top explain how to build and upload these images.
           - docker_image: zulip/ci:bionic
             name: Bionic production install
             is_bionic: true