diff --git a/README.md b/README.md
index 48d51af9..8ad6bbec 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,8 @@ $ make
 $ make check
 $ sudo make install
 ```
-On an Intel Mac, change the `configure` command for both GMP and MPFR as follows, and ignore the `make check` command:
+On an Intel Mac, the libraries should be cross-built.  
+Change the `configure` command for both GMP and MPFR as follows, and ignore the `make check` command:
 ```
 $ CFLAGS="-arch arm64" CXXFLAGS="$CFLAGS" ./configure -host=aarch64-apple-darwin --disable-shared 
 ```