diff --git a/datastructures/recur.go b/datastructures/recur.go
index 4e8edda..2cd11b8 100644
--- a/datastructures/recur.go
+++ b/datastructures/recur.go
@@ -1,5 +1,6 @@
 package datastructures
 
+// Factorial a function that computes the factorial or a number. Big (n) time and space complexity. For loop could use less memory.
 func Factorial(n int) int {
 	if n < 1 {
 		return 1
@@ -7,3 +8,11 @@ func Factorial(n int) int {
 
 	return n * Factorial(n-1)
 }
+
+func Fib(n int) int {
+	if n < 1 {
+		return 1
+	}
+
+	return Fib(n-1) + Fib(n-2)
+}
diff --git a/learn_go_with_tests/my_context/go.mod b/learn_go_with_tests/my_context/go.mod
new file mode 100644
index 0000000..991755f
--- /dev/null
+++ b/learn_go_with_tests/my_context/go.mod
@@ -0,0 +1,3 @@
+module my_context
+
+go 1.23.1