more NEWS;

--- a/NEWS	Mon Jan 18 19:25:20 2021 +0100
+++ b/NEWS	Mon Jan 18 19:53:20 2021 +0100
@@ -359,6 +359,10 @@
 * Experimental support for arm64-linux platform. The reference platform
 is Raspberry Pi 4 with 8 GB RAM running Pi OS (64 bit).
 
+* Partial support for arm64-darwin (Apple Silicon): most x86_64
+executables work well with runtime translation by Rosetta, but
+occasional problems remain (e.g. external provers).
+
 
 
 New in Isabelle2020 (April 2020)