diff --git a/HOME_EXAM.md b/HOME_EXAM.md
index 95a7da341b4355398fb2d22387acde816ffe0174..79eaf7b13897ae5bbd8e182fe5c6d954128a0f62 100644
--- a/HOME_EXAM.md
+++ b/HOME_EXAM.md
@@ -206,7 +206,7 @@ For furture development
 
 ## Your semantics
 
-Structural Operational Semantics (SOS)
+Structural Operational Semantics (SOS) for the compiler is described below in small step. 
 
 Symbols: 
 - σ, state