diff --git a/Running-from-source.md b/Running-from-source.md
index fc1d0c9..0d14fbe 100644
--- a/Running-from-source.md
+++ b/Running-from-source.md
@@ -40,7 +40,11 @@ If using a python.org package it will include this.
 On Debian, Ubuntu, and other Debian derivatives the package you need to install
 is `python3-tk`:
 
-`sudo apt install python3-tk`
+    sudo apt install python3-tk
+
+On Arch you need:
+
+    sudo pacman -S tk
 
 For other Linux distributions you will need to find the requisite package and
 how to install it.  Keep in mind you need 'tkinter' for 'python3'.  Installing