diff --git a/source/C/command_line.rst b/source/C/command_line.rst
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 Appendix C Command line
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-The command line or cli is text interface to your computer and an alternative to graphical user interfaces like windows. It typically involves typing text commands into a terminal to perform some operation. Although not necessary to learn, it can be helpful. The terminal which can be launched from :kbd:`Control + Alt + T` is a command line running in a window. 
+The command line or CLI is text interface to your computer and an alternative to graphical user interfaces like windows. It typically involves typing text commands into a terminal to perform some operation. Although not necessary to learn, it can be helpful. The terminal which can be launched from :kbd:`Control + Alt + T` is a command line running in a window. 
 
 An exhaustive tutorial on the command line is a bit beyond the scope of the manual. The man command brings up the user manual and can be used to learn more about a commands use, its options, and inputs. If you wanted to learn more about the df (disk free) command, enter the following into a command line and press :kbd:`enter` :