diff --git a/Concurrent Systems/test/Untitled.md b/Concurrent Systems/test/Untitled.md
index 3948923..01cf08d 100644
--- a/Concurrent Systems/test/Untitled.md	
+++ b/Concurrent Systems/test/Untitled.md	
@@ -73,8 +73,15 @@ operation end_write() :=
 
 ```
 CNT initalized to the value I want to initalize the semaphore
+Condition S
 
 up() :=
 	if CNT < 0 then
-		
+		S.signal()
+	CNT++
+
+down() :=
+	CNT--
+	if CNT < 0 then
+		S.wait()
 ```
\ No newline at end of file