diff --git a/Guide-To-Setup-thermal-printer-from-source-code.md b/Guide-To-Setup-thermal-printer-from-source-code.md
index fb4c7a6..25bc931 100644
--- a/Guide-To-Setup-thermal-printer-from-source-code.md
+++ b/Guide-To-Setup-thermal-printer-from-source-code.md
@@ -58,7 +58,7 @@ eg: `echo "hello world\n\n\n\n\n\n\n\n\n\n" > /tmp/DEVTERM_PRINTER_IN
 we recommend use [tmux](https://github.com/tmux/tmux/wiki) to do this job  
 so that you can run and see all the commands output in a single terminal window
 
-## For cups
+## For CUPS
 just install `devterm-thermal-printer-cups`  
 ``` sudo apt install devterm-thermal-printer-cups```