diff --git a/calamares/modules/preservefiles.conf b/calamares/modules/preservefiles.conf
index 5b74588..03e8395 100644
--- a/calamares/modules/preservefiles.conf
+++ b/calamares/modules/preservefiles.conf
@@ -1,7 +1,70 @@
+# SPDX-FileCopyrightText: no
+# SPDX-License-Identifier: CC0-1.0
+#
+# Configuration for the preserve-files job
+#
+# The *files* key contains a list of files to preserve. Each element of
+# the list should have one of these forms:
+#
+# - an absolute path (probably within the host system). This will be preserved
+#   as the same path within the target system (chroot). If, globally,
+#   *dontChroot* is true, then these items will be ignored (since the
+#   destination is the same as the source).
+# - a map with a *dest* key. The *dest* value is a path interpreted in the
+#   target system (if the global *dontChroot* is true, then the host is the
+#   target as well). Relative paths are not recommended. There are two
+#   ways to select the source data for the file:
+#   - *from*, which must have one of the values, below; it is used to
+#     preserve files whose pathname is known to Calamares internally.
+#   - *src*, to refer to a path interpreted in the host system. Relative
+#     paths are not recommended, and are interpreted relative to where
+#     Calamares is being run.
+#   Exactly one of the two source keys (either *from* or *src*) must be set.
+#
+#   Special values for the key *from* are:
+#     - *log*, for the complete log file (up to the moment the preservefiles
+#       module is run),
+#     - *config*, for a JSON dump of the contents of global storage.
+#       Note that this may contain sensitive information, and should be
+#       given restrictive permissions.
+#
+#  A map with a *dest* key can have these additional fields:
+#   - *perm*, is a colon-separated tuple of <user>:<group>:<mode>
+#     where <mode> is in octal (e.g. 4777 for wide-open, 0400 for read-only
+#     by owner). If set, the file's ownership and permissions are set to
+#     those values within the target system; if not set, no permissions
+#     are changed.
+#   - *optional*, is a boolean; if this is set to `true` then failure to
+#     preserve the file will **not** be counted as a failure of the
+#     module, and installation will proceed. Set this for files that might
+#     not exist in the host system (e.g. nvidia configuration files that
+#     are created in some boot scenarios and not in others).
+#
+# The target path (*dest*) is modified by expanding variables in `${}`:
+#   - `ROOT` is replaced by the path to the target root (may be /).
+#     There is never any reason to use this, since the *dest* is already
+#     interpreted in the target system.
+#   - `USER` is replaced by the username entered by on the user
+#       page (may be empty, for instance if no user page is enabled)
+#
+#
+#
 files:
   - from: log
     dest: /var/log/Calamares.log
     perm: root:root:644
+  # - from: log
+  #   dest: /home/${USER}/installation.log
+  #   optional: true
   - from: config
     dest: /var/log/Calamares-install.json
     perm: root:root:644
+# - src: /var/log/nvidia.conf
+#   dest: /var/log/Calamares-nvidia.conf
+#   optional: true
+
+# The *perm* key contains a default value to apply to all files listed
+# above that do not have a *perm* key of their own. If not set,
+# root:root:0400 (highly restrictive) is used.
+#
+# perm: "root:root:0400"
\ No newline at end of file