:: commit 43c48c13eff5b2ff9515bfa112c001595e03100f

diff --git a/PORTING.md b/PORTING.md
index 7aaff0d..cf20de7 100644
--- a/PORTING.md
+++ b/PORTING.md
@@ -2,3 +2,7 @@
 ## Windows
 
 Porting to Windows shouldn't be hard when using Cygwin. Make sure to install `gcc` (because `clang` seems to work poorly on Cygwin), update the Makefile to use `gcc` and update the `CFLAGS` variable - remove `-g3` and `-fPIC`, add `-D_WIN32`. Replace `.so` with `.dll` in the shared library name.
+
+## M1 MacOS
+
+Clang doesn't support `-march=native -mtune=native`, so you should remove them.