diff --git a/subjects/reversebits.en.md b/subjects/reversebits.en.md
index 6839fe35..9a5199c1 100644
--- a/subjects/reversebits.en.md
+++ b/subjects/reversebits.en.md
@@ -13,7 +13,7 @@ This means that:
 
 ### Instructions
 
-Write a function that takes a `byte` in binary format, that reverses it `bit` by `bit` (as shown in the example) and returns the result
+Write a function that takes a `byte`, reverses it `bit` by `bit` (as shown in the example) and returns the result.
 
 ### Expected function
 
@@ -24,7 +24,7 @@ func ReverseBits(by byte) byte {
 ```
 ### Usage
 
-Here is a possible [program](TODO-LINK) to test your function :
+Here is a possible program to test your function :
 
 ```go
 package main
@@ -40,7 +40,7 @@ func main() {
 }
 ```
 
-### Expected output
+and its output :
 
 ```console
 student@ubuntu:~/piscine-go/reversebits$ go build
diff --git a/subjects/reversebits.fr.md b/subjects/reversebits.fr.md
index 50126970..78977347 100644
--- a/subjects/reversebits.fr.md
+++ b/subjects/reversebits.fr.md
@@ -2,19 +2,39 @@
 
 ### Instructions
 
-Écrire un programme qui prend un `byte`, qui l'inverse `bit` par `bit` (comme montré sur l'exemple) et qui affiche le résultat.
+Écrire une fonction qui prend un `byte`, qui l'inverse `bit` par `bit` (comme montré sur l'exemple) et qui retourne le résultat.
 
+### Fonction attendue
+
+```go
+func ReverseBits(by byte) byte {
+
+}
+```
 ### Utilisation
 
+Voici un programme possible pour tester votre fonction :
+
+```go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	a := byte(0x26)
+	fmt.Printf("%08b\n", a)
+	fmt.Printf("%08b\n", ReverseBits(a))
+}
+```
+
+et son résultat :
+
 ```console
 student@ubuntu:~/piscine-go/reversebits$ go build
 student@ubuntu:~/piscine-go/reversebits$ ./reversebits
-Not enough arguments.
-student@ubuntu:~/piscine-go/reversebits$ ./reversebits 00100110 | cat -e
-01100100$
-student@ubuntu:~/piscine-go/reversebits$ ./reversebits "djs"
-The argument "djs" does not represent a byte
-student@ubuntu:~/piscine-go/reversebits$ ./reversebits "0102039s" | cat -e
-The argument "0102039s" does not represent a byte$
+00100110
+01100100
 student@ubuntu:~/piscine-go/reversebits$
 ```