diff --git a/knowledge base/cpufreq.md b/knowledge base/cpufreq.md
index f1ec5fa..cda2c8d 100644
--- a/knowledge base/cpufreq.md	
+++ b/knowledge base/cpufreq.md	
@@ -17,7 +17,7 @@ sudo cpupower frequency-set --governor powersave
 sudo cpupower frequency-set --governor schedutil
 ```
 
-## Sources
+## Further readings
 
 - [CPU frequency scaling]
 - [CPU governer settings ignore nice load]
diff --git a/knowledge base/set the ondemand cpu governor to not rise the frequencies for niced load.md b/knowledge base/set the ondemand cpu governor to not rise the frequencies for niced load.md
index 56ed59e..fc775ee 100644
--- a/knowledge base/set the ondemand cpu governor to not rise the frequencies for niced load.md	
+++ b/knowledge base/set the ondemand cpu governor to not rise the frequencies for niced load.md	
@@ -10,8 +10,11 @@ echo 1 | sudo tee /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load
 echo "w /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load - - - - 1" | sudo tee /etc/tmpfiles.d/ondemand-ignore-nice.conf
 ```
 
-## Sources
+## Further readings
 
+- [Cpufreq]
 - [Laptop overheating and battery duration reduction]
 
+[cpufreq]: cpufreq.md
+
 [laptop overheating and battery duration reduction]: https://wiki.archlinux.org/?title=BOINC#Laptop_overheating_and_battery_duration_reduction