diff --git a/subjects/atoibaseprog.en.md b/subjects/atoibaseprog.en.md
new file mode 100644
index 000000000..4022d16fc
--- /dev/null
+++ b/subjects/atoibaseprog.en.md
@@ -0,0 +1,38 @@
+## atoibase
+
+### Instructions
+
+Write a program that takes a `string` number and its `string` base as arguments and prints its conversion as an `int`.
+
+- If the base or the `string` number is not valid it returns `0`.
+
+- If the number of arguments is bigger or lower that two it should print a newline `\n`.
+
+Validity rules for a base :
+
+- A base must contain at least 2 characters.
+- Each character of a base must be unique.
+- A base should not contain `+` or `-` characters.
+
+Only valid `string` numbers will be tested.
+
+The program **does not have** to manage negative numbers.
+
+### Expected output :
+
+```console
+student@ubuntu:~/atoibaseprog$ go build
+student@ubuntu:~/atoibaseprog$ ./atoibaseprog 125 0123456789
+125
+student@ubuntu:~/atoibaseprog$ ./atoibaseprog 1111101 01
+125
+student@ubuntu:~/atoibaseprog$ ./atoibaseprog 7D 0123456789ABCDEF
+125
+student@ubuntu:~/atoibaseprog$ ./atoibaseprog uoi choumi
+125
+student@ubuntu:~/atoibaseprog$ ./atoibaseprog bbbbbab -ab
+0
+student@ubuntu:~/atoibaseprog$ ./atoibaseprog 1111101
+
+student@ubuntu:~/atoibaseprog$
+```
diff --git a/subjects/doop.en.md b/subjects/doop.en.md
index 1e55cfd8e..5b74f28b6 100644
--- a/subjects/doop.en.md
+++ b/subjects/doop.en.md
@@ -32,7 +32,7 @@ student@ubuntu:~/piscine-go/test$ ./doop 1 p 1 | cat -e
 student@ubuntu:~/piscine-go/test$ ./doop 1 / 0 | cat -e
 No division by 0$
 student@ubuntu:~/piscine-go/test$ ./doop 1 % 0 | cat -e
-No modulo by 0$
+No Modulo by 0$
 student@ubuntu:~/piscine-go/test$ ./doop 1 "*" 1
 1
 ```