diff --git a/subjects/ispowerof2/README.md b/subjects/ispowerof2/README.md
index 39c06c6f..cb85f0d7 100644
--- a/subjects/ispowerof2/README.md
+++ b/subjects/ispowerof2/README.md
@@ -4,11 +4,11 @@
 
 Write a program that determines if a given number is a power of 2.
 
-This program must print `true` if the given number is a power of 2, otherwise it prints `false`.
+This program must print `true` if the given number is a power of 2, otherwise it has to print `false`.
 
 - If there is more than one or no argument the program should print nothing.
 
-- When there is only one argument, it will always be a positive valid int.
+- When there is only one argument, it will always be a positive valid `int`.
 
 ### Usage :
 
diff --git a/subjects/max/README.md b/subjects/max/README.md
index d3b71e4b..8cb667dd 100644
--- a/subjects/max/README.md
+++ b/subjects/max/README.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-Write a function, `Max`, that returns the maximum value in a slice of integers. If the slice is empty, returns 0.
+Write a function `Max` that will return the maximum value in a slice of integers. If the slice is empty it will return 0.
 
 ### Expected function
 
diff --git a/subjects/rot13/README.md b/subjects/rot13/README.md
index 6e2b38f4..a8aa3549 100644
--- a/subjects/rot13/README.md
+++ b/subjects/rot13/README.md
@@ -3,7 +3,7 @@
 ### Instructions
 
 Write a program that takes a `string` and displays it, replacing each of its
-letters by the letter 13 spaces ahead in alphabetical order.
+letters by the letter 13 spots ahead in alphabetical order.
 
 - 'z' becomes 'm' and 'Z' becomes 'M'. The case of the letter stays the same.
 
diff --git a/subjects/rot14/README.md b/subjects/rot14/README.md
index 61700061..c18aa671 100644
--- a/subjects/rot14/README.md
+++ b/subjects/rot14/README.md
@@ -2,7 +2,10 @@
 
 ### Instructions
 
-Write a function `rot14` that returns the `string` within the parameter transformed into a `rot14 string`, that replaces a letter with the 14th letter after it, in the alphabet.
+Write a function `rot14` that returns the `string` within the parameter transformed into a `rot14 string`.
+Each letter will be replaced by the letter 14 spots ahead in the alphabetical order.
+
+- 'z' becomes 'n' and 'Z' becomes 'N'. The case of the letter stays the same.
 
 ### Expected function
 
@@ -25,7 +28,7 @@ import (
 )
 
 func main() {
-	result := piscine.Rot14("Hello How are You")
+	result := piscine.Rot14("Hello! How are You?")
 
 	for _, r := range result {
 		z01.PrintRune(r)
diff --git a/subjects/searchreplace/README.md b/subjects/searchreplace/README.md
index 6a3ff8aa..52adfef5 100644
--- a/subjects/searchreplace/README.md
+++ b/subjects/searchreplace/README.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-Write a program that takes 3 arguments, the first argument is a `string` in which to replace a letter (the 2nd argument) by another one (the 3rd argument).
+Write a program that takes 3 arguments, the first argument is a `string` in which a letter (the 2nd argument) will be replaced by another one (the 3rd argument).
 
 - If the number of arguments is different from 3, the program displays nothing.
 
@@ -13,6 +13,8 @@ Write a program that takes 3 arguments, the first argument is a `string` in whic
 ```console
 $ go run . "hella there" "a" "o"
 hello there
+$ go run . "hallo thara" "a" "e"
+hello there
 $ go run . "abcd" "z" "l"
 abcd
 $ go run . "something" "a" "o" "b" "c"
diff --git a/subjects/wdmatch/README.md b/subjects/wdmatch/README.md
index 9fa242ce..6e5f0e2e 100644
--- a/subjects/wdmatch/README.md
+++ b/subjects/wdmatch/README.md
@@ -2,7 +2,7 @@
 
 ### Instructions
 
-Write a program that takes two `string` and checks whether it is possible to write the first `string` with characters from the second `string`, while respecting the order in which these characters appear in the second `string`.
+Write a program that takes two `string` and checks whether it is possible to write the first `string` with characters from the second `string`. This rewrite must respect the order in which these characters appear in the second `string`.
 
 If it is possible, the program displays the `string` followed by a newline (`'\n'`), otherwise it simply displays nothing.
 
@@ -11,6 +11,8 @@ If the number of arguments is different from 2, the program displays nothing.
 ### Usage
 
 ```console
+$ go run . 123 123
+123
 $ go run . faya fgvvfdxcacpolhyghbreda
 faya
 $ go run . faya fgvvfdxcacpolhyghbred