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diff --git a/lib/bigfloat.pl b/lib/bigfloat.pl
index 8c28abd..9f94e84 100644
--- a/lib/bigfloat.pl
+++ b/lib/bigfloat.pl
@@ -3,12 +3,18 @@ require "bigint.pl";
 #
 # This library is no longer being maintained, and is included for backward
 # compatibility with Perl 4 programs which may require it.
+# This legacy library is deprecated and will be removed in a future
+# release of perl.
 #
 # In particular, this should not be used as an example of modern Perl
 # programming techniques.
 #
 # Suggested alternative: Math::BigFloat
-#
+
+warn( "The 'bigfloat.pl' legacy library is deprecated and will be"
+      . " removed in the next major release of perl. Please use the"
+      . " Math::BigFloat module instead." );
+
 # Arbitrary length float math package
 #
 # by Mark Biggar