diff --git a/README.md b/README.md
index da3dac2..1125380 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@
 gcc -Wall -Wextra -g -o iv iv.c `sdl2-config --cflags --libs`
 ```
 
+`-Wall`, `-Wextra`, `-g` can be omitted. 
+
 ## Run with 
 
 ```