diff --git a/modules/module-default-profile.c b/modules/module-default-profile.c
index 30b8c715..2571a4a1 100644
--- a/modules/module-default-profile.c
+++ b/modules/module-default-profile.c
@@ -23,6 +23,16 @@ enum
 
 static guint signals[LAST_SIGNAL] = { 0 };
 
+/*
+ * Module caches the profile selected for a device and restores it when the
+ * device appears afresh. The cached properties are remembered across reboots.
+ * It provides an API for modules and scripts to query the default profile.
+ */
+
+/*
+ * settings file: device-settings.conf
+ */
+
 G_DECLARE_DERIVABLE_TYPE (WpDefaultProfile, wp_default_profile, WP,
     DEFAULT_PROFILE, WpPlugin)
 
diff --git a/src/config/wireplumber.conf.d/device-settings.conf b/src/config/wireplumber.conf.d/device-settings.conf
index b9678a18..6e789ef7 100644
--- a/src/config/wireplumber.conf.d/device-settings.conf
+++ b/src/config/wireplumber.conf.d/device-settings.conf
@@ -1,4 +1,4 @@
-# Settigs to Track/store/restore user choices about devices
+# Settings to Track/store/restore user choices about devices
 
 wireplumber.components = [
   # Selects appropriate default nodes and enables saving and restoring them
@@ -39,8 +39,9 @@ wireplumber.settings = {
   # device default volume level
   # device.default-volume = 0.5
 
-  # Sets persistent device profiles that should never change when wireplumber is
-  # running, even if a new profile with higher priority becomes available
+  # Sets persistent device profiles that should never be changed, when
+  # wireplumber is running, even if a new profile with higher priority becomes
+  # available
   device = [
     {
       matches = [
diff --git a/src/scripts/policy-device-profile.lua b/src/scripts/policy-device-profile.lua
index e03086e8..b7119080 100644
--- a/src/scripts/policy-device-profile.lua
+++ b/src/scripts/policy-device-profile.lua
@@ -5,6 +5,11 @@
 --
 -- SPDX-License-Identifier: MIT
 
+-- Script selects and enables a profile for a device. It implements the
+-- persistant profiles funtionality.
+
+-- Settings file: device-settings.conf
+
 local self = {}
 self.active_profiles = {}
 self.default_profile_plugin = Plugin.find ("default-profile")