diff --git a/knowledge base/lower the power consumption on linux.md b/knowledge base/lower the power consumption on linux.md
new file mode 100644
index 0000000..3bf8918
--- /dev/null
+++ b/knowledge base/lower the power consumption on linux.md	
@@ -0,0 +1,19 @@
+# Lower the power consumption on Linux
+
+```sh
+echo '0' > '/proc/sys/kernel/nmi_watchdog'
+echo 'med_power_with_dipm' > '/sys/class/scsi_host/host0/link_power_management_policy'
+
+# Increase the virtual memory dirty writeback time to help aggregating disk I/O
+# together. This reduces spanned disk writes.
+# Value is in 1/100s of seconds. Default is 500 (5 seconds).
+echo 6000 > '/proc/sys/vm/dirty_writeback_centisecs'
+sudo sysctl vm.dirty_writeback_centisecs=6000
+```
+
+## Sources
+
+- Arch Wiki's [power management][arch wiki power management] page
+
+<!-- -->
+[arch wiki power management]: https://wiki.archlinux.org/title/Power_management
diff --git a/knowledge base/sysctl.md b/knowledge base/sysctl.md
index 62a8dac..6cc38b6 100644
--- a/knowledge base/sysctl.md	
+++ b/knowledge base/sysctl.md	
@@ -12,24 +12,25 @@ Default configuration files locations:
 ## TL;DR
 
 ```sh
-# see the value of a single setting
+# Show the value of a single setting.
 sysctl kernel.ostype
+sysctl vm.swappiness
 
-# see the values of all settings
+# Show the values of all settings.
 sysctl -a
 
-# change the current value of a setting
+# Change the current value of a setting.
 sudo sysctl vm.swappiness=10
 sudo sysctl -w net.ipv4.ip_forward=1
 
-# reload settings from a single configuration file
+# Reload settings from specific configuration files.
 sudo sysctl -p
 sudo sysctl -p /etc/sysctl.d/99-swappiness.conf
 
-# reload settings from the default configuration files locations
+# Reload settings from the default configuration files locations.
 sudo sysctl --system
 
-# persistent configuration
+# Set up persistent settings.
 echo 'vm.swappiness=10'  | sudo tee -a /etc/sysctl.conf
 echo 'vm.swappiness = 5' | sudo tee -a /etc/sysctl.d/99-swappiness.conf
 ```
@@ -37,5 +38,10 @@ echo 'vm.swappiness = 5' | sudo tee -a /etc/sysctl.d/99-swappiness.conf
 ## Further readings
 
 - [How to reload sysctl.conf variables on Linux]
+- [Documentation for /proc/sys]
 
+<!-- official documentation -->
+[documentation for /proc/sys]: https://docs.kernel.org/admin-guide/sysctl/
+
+<!-- forums -->
 [how to reload sysctl.conf variables on linux]: https://www.cyberciti.biz/faq/reload-sysctl-conf-on-linux-using-sysctl/