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diff --git a/readme.md b/readme.md
index f2033e4..bce371a 100644
--- a/readme.md
+++ b/readme.md
@@ -1,6 +1,8 @@
 
 optimized build : `clang ./src/*.c -lm -lglfw -lGL -lGLEW -fno-trapping-math`
 
+optional flags : -Dskip_memory_trace -Dstfu
+
 # todo
 
 - find a better epsilon