diff --git a/README.md b/README.md
index b411a14..52dd6ba 100644
--- a/README.md
+++ b/README.md
@@ -44,3 +44,4 @@ Note - you'll have to change the Visual Studio version if you are using a differ
 
 After building, the plugin will be in **build/neural_amp_modeler.lv2**.
 
+If you have an older processor that does not support moder x64 optimizations, you may need to pass "**-DUSE_NATIVE_ARCH=OFF**" on your cmake command line.