diff --git a/src/articles/linux_internals.md b/src/articles/linux_internals.md
index a84353b..e5929c0 100644
--- a/src/articles/linux_internals.md
+++ b/src/articles/linux_internals.md
@@ -97,10 +97,6 @@ Important libraries:
 * `libnotify`
 * `libudev`
 
-
-
-
-
 ## Devices ##
 
 Devices are managed in user space with the `udev` utility - which has the following parts:
@@ -124,6 +120,21 @@ Display servers can react to device input events via the `libinput` library, whi
 
 The Desktop-Bus (DBus) is a user space middleware allowing communication between multiple processes (e.g. IPC).
 
+## Audio ##
+
+ALSA (Advanced Linux Sounds Architecture) - has both kernel and user-space elements, the later with alsa-lib.
+
+
+Pipewire is a new low-level multimedia framework.
+
+## Power Managemenr ##
+
+UPower (previously DeviceKit-power) is a power manement middleware - it spawns `upowerd`.
+
+Systemd has some session and power management through its logind. The elogind is a standalone fork of this logind.
+
+The `systemctl suspend` analogue for elogind is `loginctl suspend`.
+
 ## Other ##
 
 * avahi