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diff --git a/lib/look.pl b/lib/look.pl
index e8dc8aa..ccc9b61 100644
--- a/lib/look.pl
+++ b/lib/look.pl
@@ -1,5 +1,11 @@
 ;# Usage: &look(*FILEHANDLE,$key,$dict,$fold)
-
+#
+# This library is no longer being maintained, and is included for backward
+# compatibility with Perl 4 programs which may require it.
+#
+# In particular, this should not be used as an example of modern Perl
+# programming techniques.
+#
 ;# Sets file position in FILEHANDLE to be first line greater than or equal
 ;# (stringwise) to $key.  Pass flags for dictionary order and case folding.