diff --git a/03-monolith/README.md b/03-monolith/README.md
index 0682077..8a8b91f 100644
--- a/03-monolith/README.md
+++ b/03-monolith/README.md
@@ -4,6 +4,7 @@ Style #3
 Constraints:
 
 - No abstractions
+- No use of library functions
 
 Possible names: