diff --git a/calamares/modules/packages.conf b/calamares/modules/packages.conf
index e42e8e9..49fdbb6 100644
--- a/calamares/modules/packages.conf
+++ b/calamares/modules/packages.conf
@@ -1,15 +1,38 @@
+# SPDX-FileCopyrightText: no
+# SPDX-License-Identifier: CC0-1.0
+#
+# The configuration for the package manager starts with the
+# *backend* key, which picks one of the backends to use.
+# In `main.py` there is a base class `PackageManager`.
+# Implementations must subclass that and set a (class-level)
+# property *backend* to the name of the backend (e.g. "dummy").
+# That property is used to match against the *backend* key here.
+#
+# You will have to add such a class for your package manager.
+# It is fairly simple Python code. The API is described in the
+# abstract methods in class `PackageManager`. Mostly, the only
+# trick is to figure out the correct commands to use, and in particular,
+# whether additional switches are required or not. Some package managers
+# have more installer-friendly defaults than others, e.g., DNF requires
+# passing --disablerepo=* -C to allow removing packages without Internet
+# connectivity, and it also returns an error exit code if the package did
+# not exist to begin with.
 ---
 #
 # Which package manager to use, options are:
-#  - packagekit  - PackageKit CLI tool
-#  - zypp        - Zypp RPM frontend
-#  - yum         - Yum RPM frontend
-#  - dnf         - DNF, the new RPM frontend
-#  - urpmi       - Mandriva package manager
+#  - apk         - Alpine Linux package manager
 #  - apt         - APT frontend for DEB and RPM
+#  - dnf         - DNF, the new RPM frontend
+#  - entropy     - Sabayon package manager (is being deprecated)
+#  - luet        - Sabayon package manager (next-gen)
+#  - packagekit  - PackageKit CLI tool
 #  - pacman      - Pacman
+#  - pamac       - Manjaro package manager
 #  - portage     - Gentoo package manager
-#  - entropy     - Sabayon package manager
+#  - yum         - Yum RPM frontend
+#  - zypp        - Zypp RPM frontend
+#
+# Not actually a package manager, but suitable for testing:
 #  - dummy       - Dummy manager, only logs
 #
 backend: dummy
@@ -55,22 +78,25 @@ update_system: false
 # that is in this configuration file).
 #
 # Allowed package operations are:
-#  - install, try_install: will call the package manager to
+#  - *install*, *try_install*: will call the package manager to
 #       install one or more packages. The install target will
 #       abort the whole installation if package-installation
 #       fails, while try_install carries on. Packages may be
 #       listed as (localized) names, or as (localized) package-data.
 #       See below for the description of the format.
-# - localInstall: this is used to call the package manager
+# - *localInstall*: this is used to call the package manager
 #       to install a package from a path-to-a-package. This is
 #       useful if you have a static package archive on the install media.
 #       The *pacman* package manager is the only one to specially support
 #       this operation (all others treat this the same as *install*).
-# - remove, try_remove: will call the package manager to
+# - *remove*, *try_remove*: will call the package manager to
 #       remove one or more packages. The remove target will
 #       abort the whole installation if package-removal fails,
 #       while try_remove carries on. Packages may be listed as
 #       (localized) names.
+# One additional key is recognized, to help netinstall out:
+# - *source*: ignored, does get logged
+# Any other key is ignored, and logged as a warning.
 #
 # There are two formats for naming packages: as a name or as package-data,
 # which is an object notation providing package-name, as well as pre- and