diff --git a/ts-lua/types/RAGE/System.d.ts b/ts-lua/types/RAGE/System.d.ts
index e83af72..2e17c17 100644
--- a/ts-lua/types/RAGE/System.d.ts
+++ b/ts-lua/types/RAGE/System.d.ts
@@ -4,7 +4,8 @@
  */
 declare namespace system {
 
-    
+    function wait(ms: int): void
+    function yield(ms: int): void
 
 }