diff --git a/lang/isocode.go b/lang/isocode.go
new file mode 100644
index 0000000..692b7bb
--- /dev/null
+++ b/lang/isocode.go
@@ -0,0 +1,11 @@
+package utils
+
+var isoCodes = map[string]bool{
+	"eng":     true, // English
+	"swa":     true, // Swahili
+	"default": true, // Default language: English
+}
+
+func IsValidISO639(code string) bool {
+	return isoCodes[code]
+}