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diff --git a/lib/flush.pl b/lib/flush.pl
index 55002b9..8aa6d55 100644
--- a/lib/flush.pl
+++ b/lib/flush.pl
@@ -1,3 +1,12 @@
+#
+# 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.
+#
+# Suggested alternative: IO::Handle
+#
 ;# Usage: &flush(FILEHANDLE)
 ;# flushes the named filehandle