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-rw-r--r--isar/README4
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diff --git a/isar/README b/isar/README
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@@ -23,7 +23,9 @@ There is no support for proof by pointing yet, and no tags program.
The script `interface' and file 'interface-setup.el' are used
internally to start Isabelle Proof General via the 'Isabelle' shell
command. This is the default way to invoke Proof General from the
-Isabelle perspective.
+Isabelle perspective; it enables Isabelle to provide a consistent
+process and file-system environment, including the all-important
+isar-keywords.el file.
Check the value of isabelle-prog-name.