formating

subjects/addprimesum.en.md

@@ -4,9 +4,9 @@
 
 Write a program that takes a positive integer as argument and displays the sum of all prime numbers inferior or equal to it followed by a newline.
 
-- If the number of arguments is not 1, or the argument is not a positive number, just display 0 followed by a newline.
+- If the number of arguments is not 1, or if the argument is not a positive number, the program displays 0 followed by a newline.
 
-Example of output :
+Examples of outputs :
 
 ```console
 student@ubuntu:~/piscine/test$ go build