diff --git a/subjects/countstars/README.md b/subjects/countstars/README.md
new file mode 100644
index 00000000..44711379
--- /dev/null
+++ b/subjects/countstars/README.md
@@ -0,0 +1,31 @@
+## CountStars
+
+### Instructions
+Write a function named `CountStar` that makes u fall asleep by counting stars, it takes an integer in the parameter
+- If the number is negative or equal to 0, return "`No star`"
+- No need to manage overflow.
+
+```go
+func CountStar(num int) string {
+
+}
+```
+```go
+import (
+	"fmt"
+	"strconv"   
+)
+
+func main() {
+	fmt.Println(CountStar(5))
+	fmt.Println(CountStar(4))
+	fmt.Println(CountStar(-1))
+}
+```
+
+```console
+$ go run . | cat -e
+1 star...2 star...3 star...4 star...5$
+1 star...2 star...3 star...4$
+No star$
+```