--- a/NEWS Thu Jan 03 20:16:42 2019 +0100
+++ b/NEWS Thu Jan 03 21:04:16 2019 +0100
@@ -160,9 +160,14 @@
external compiler is applied.
-
*** System ***
+* The command-line tool "isabelle update" uses Isabelle/PIDE in
+batch-mode to update theory sources based on semantic markup produced in
+Isabelle/ML. Actual updates depend on system options that may be enable
+via "-u OPT" (for "update_OPT"). Sessions are specified as in "isabelle
+dump".
+
* Support for Isabelle command-line tools defined in Isabelle/Scala.
Instances of class Isabelle_Scala_Tools may be configured via the shell
function "isabelle_scala_tools" in etc/settings (e.g. of an Isabelle