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diff --git a/helm/software/lambda-delta/automath/grundlagen.aut b/helm/software/lambda-delta/automath/grundlagen.aut
index af671cfb3..34e5493ab 100644
--- a/helm/software/lambda-delta/automath/grundlagen.aut
+++ b/helm/software/lambda-delta/automath/grundlagen.aut
@@ -1,3 +1,7 @@
+# Landau's "Grundlagen der Analysis", formal specification in AUTOMATH
+# Copyright (C) 1977, L.S. van Benthem Jutting
+#               1992, revised by F. Wiedijk (http://www.cs.ru.nl/~freek/aut/)
+
 +l
 @[a:'prop'][b:'prop']
 imp:=[x:a]b:'prop'