diff --git a/yast/hello.scm b/yast/hello.scm
index 4c0841a..83d2f17 100644
--- a/yast/hello.scm
+++ b/yast/hello.scm
@@ -1 +1,18 @@
+;; Hello world as a variable
+(define vhello "Hello world")
+;; Hello World as a function
+(define fhello (lambda ()
+		 "hello world"))
+
+;; hello with name
+(define hello
+  (lambda (name)
+    (string-append "hello " name "!")))
+
+;; sum of three numbers
+(define sum3
+  (lambda (a b c)
+    (+ a b c)))
+
+;; display message on screen
 (display "Hello World!")