diff --git a/Section4/go.mod b/Section4/go.mod
new file mode 100644
index 0000000..07d0bb5
--- /dev/null
+++ b/Section4/go.mod
@@ -0,0 +1,3 @@
+module master_go_programming/Section4
+
+go 1.21.1
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..e259a41
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module master_go_programming
+
+go 1.21.1