diff --git a/README.md b/README.md
index 171cd3d..e2ee21a 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ You can have a look inside the `Makefile` and its comments. It will try to autod
 
 ```
 # try this first
-CFLAGS = -O3 -Ofast -fno-fast-math -Wno-unused-result
+CFLAGS = -Ofast -fno-fast-math -Wno-unused-result
 # try this second
 CFLAGS = -O3 -Wno-unused-result
 ```
@@ -170,4 +170,4 @@ The time drops down to 26ms/iteration. So we have a gap to close :)! At the curr
 
 ## license
 
-MIT
\ No newline at end of file
+MIT