Admin/lib/Tools/makedist

--- a/Admin/lib/Tools/makedist	Fri Sep 06 12:46:50 2013 +0200
+++ b/Admin/lib/Tools/makedist	Fri Sep 06 15:47:51 2013 +0200
@@ -140,7 +140,7 @@
     echo "IMPORTANT NOTE"
     echo "=============="
     echo
-    echo "This is snapshot of Isabelle/${IDENT} from the repository."
+    echo "This is a snapshot of Isabelle/${IDENT} from the repository."
     echo
   } >ANNOUNCE
 else