diff --git a/Guide-To-Setup-thermal-printer-from-source-code.md b/Guide-To-Setup-thermal-printer-from-source-code.md
index 25bc931..30c565d 100644
--- a/Guide-To-Setup-thermal-printer-from-source-code.md
+++ b/Guide-To-Setup-thermal-printer-from-source-code.md
@@ -2,7 +2,7 @@
 Before everything
 We assume that you have a Devterm with stock os running  
 and a little bit of Linux compiling experience   
-know how to install packages through package manager like apt    
+know how to install packages by package manager like apt    
 
 ## WiringPi 
 ### CM3 or CM4