diff --git a/README.txt b/README.txt
index 4723bf6..77eddab 100644
--- a/README.txt
+++ b/README.txt
@@ -9,7 +9,7 @@ void engine_render()
 
 > TIME
 long long engine_time_get()
-engine_sleep(long long ms)
+void engine_sleep(long long ms)
 
 > LOGIC
 struct ENGINE_EVENT engine_get_event()