diff --git a/ansible/inventory/host_vars/london-b.yml b/ansible/inventory/host_vars/london-b.yml
index 9b8f2c9..c446391 100644
--- a/ansible/inventory/host_vars/london-b.yml
+++ b/ansible/inventory/host_vars/london-b.yml
@@ -20,9 +20,6 @@ snap_services:
 apt_user_services:
   - syncthing@pez
 
-# Third-party apt repos (deployed by common role). The lunar -> noble upgrade
-# disabled all of them (PESO-160). Plex moved to repo.plex.tv with a new key;
-# the old downloads.plex.tv repo stopped at 1.42.2.
 common_apt_repositories:
   - name: tailscale
     uris: https://pkgs.tailscale.com/stable/ubuntu
@@ -40,9 +37,6 @@ common_apt_repositories:
     components: main
     signed_by: https://downloads.plex.tv/plex-keys/PlexSign.v2.key
 
-# Leftovers from the upgrade. Sonarr v3 (apt.sonarr.tv) and its mono repo are
-# dead ends, nvidia-container-toolkit isn't used by Docker here, and datadog
-# is retired, so those repos go without replacements.
 common_apt_cleanup_files:
   - /etc/apt/sources.list.d/datadog.list.distUpgrade
   - /etc/apt/sources.list.d/graphics-drivers-ubuntu-ppa-lunar.list.distUpgrade
diff --git a/ansible/roles/common/defaults/main.yml b/ansible/roles/common/defaults/main.yml
index 9d7bbec..c2e60b4 100644
--- a/ansible/roles/common/defaults/main.yml
+++ b/ansible/roles/common/defaults/main.yml
@@ -6,9 +6,5 @@ common_ufw_allowed_ports: []
 #   - {port: 80, proto: tcp, comment: "HTTP"}
 #   - {port: 443, proto: tcp, comment: "HTTPS"}
 
-# Third-party apt repositories, written as deb822 .sources files.
-# Each item needs name, uris, suites, components and signed_by (key URL).
 common_apt_repositories: []
-
-# Leftover apt source and keyring files to delete, e.g. after a release upgrade.
 common_apt_cleanup_files: []
diff --git a/ansible/roles/common/tasks/main.yml b/ansible/roles/common/tasks/main.yml
index dff22dc..3268b85 100644
--- a/ansible/roles/common/tasks/main.yml
+++ b/ansible/roles/common/tasks/main.yml
@@ -20,10 +20,6 @@
     force: true
   when: common_github_cli_source.stat.exists
 
-# Third-party apt repos are declared per host in common_apt_repositories. A
-# release upgrade disables them silently (london-b's lunar -> noble upgrade
-# left tailscale, jellyfin and plex frozen for a year), so they live in code.
-# A URL in signed_by is fetched into /etc/apt/keyrings by deb822_repository.
 - name: Install deb822_repository dependency
   ansible.builtin.apt:
     name: python3-debian
@@ -50,7 +46,6 @@
   loop: "{{ common_apt_cleanup_files }}"
   register: common_apt_cleanup_result
 
-# Refresh straight away when the sources changed, otherwise at most hourly.
 - name: Update apt cache
   ansible.builtin.apt:
     update_cache: true