--- a/src/Pure/ROOT.ML Sat Feb 10 11:19:28 2018 +0100
+++ b/src/Pure/ROOT.ML Sat Feb 10 11:55:12 2018 +0100
@@ -1,3 +1,13 @@
+(* Title: Pure/ROOT.ML
+ Author: Makarius
+
+Main entry point for the Isabelle/Pure bootstrap process.
+
+Note: When this file is open in the Prover IDE, the ML files of
+Isabelle/Pure can be explored interactively. This is a separate copy of
+Pure within Pure: it does not affect the running logic session.
+*)
+
chapter "Isabelle/Pure bootstrap";
ML_file "ML/ml_name_space.ML";