diff --git a/subjects/doop.md b/subjects/doop.en.md
similarity index 65%
rename from subjects/doop.md
rename to subjects/doop.en.md
index 5fbbe91d..eb6abf9c 100644
--- a/subjects/doop.md
+++ b/subjects/doop.en.md
@@ -4,15 +4,15 @@
 
 Write a program that takes three strings:
 
-- The first and the third one are representations of  base-10 signed integers that fit in an int.
+- The first and the third one are representations of base-10 signed integers that fit in an int.
 
 - The second one is an arithmetic operator chosen from: `+ - * / %`
 
 - The program must display the result of the requested arithmetic operation, followed by a newline. If the number of parameters is not 3, the program just displays a newline.
 
-- You can assume the string have no mistakes or extraneous characters. Negative numbers, in input or output, will have one and only one leading `-`. The result of the operation fits in an int.
+- During tests the strings will have no mistakes or extraneous characters. Negative numbers, in input or output, will have one and only one leading `-`. The result of the operation will fit in an int.
 
-Example of output :
+Examples of outputs :
 
 ```console
 student@ubuntu:~/piscine/test$ go build
@@ -25,4 +25,4 @@ student@ubuntu:~/piscine/test$ ./test "10" "+" "-43"
 student@ubuntu:~/piscine/test$ ./test
 
 student@ubuntu:~/piscine/test$
-```
\ No newline at end of file
+```