diff --git a/simulator/readme.md b/simulator/readme.md
index d0b52cab9e..79bff64903 100644
--- a/simulator/readme.md
+++ b/simulator/readme.md
@@ -1 +1,3 @@
 Win32 or posix version of firmware allows to explore rusEFI on a PC without any embedded hardware!
+
+Simulator runs a subset of ECU on your pc, easier to debug some things, tighter dev loop.