diff --git a/plugins/warnings b/plugins/warnings
new file mode 100755
index 0000000..ebf46f1
--- /dev/null
+++ b/plugins/warnings
@@ -0,0 +1,43 @@
+#!perl
+
+# The file format for 'revbank.warnings' is simply two whitespace separated
+# columns: product id (or /regex/ for descriptions) and the warning text.
+
+sub _read_warnings {
+    open my $fh, 'revbank.warnings' or die $!;
+    return map {
+        my ($matcher, $text) = split " ", $_, 2;
+        chomp $text;
+
+        my ($regex) = $matcher =~ m[^/([^/]+)/$];
+
+        $regex
+        ? sub {
+            my ($id, $desc) = @_;
+            $desc =~ /$regex/i ? $text : ();
+        }
+        : sub {
+            my ($id, $desc) = @_;
+            (grep { $_ eq $id } split /,/, $matcher) ? $text : ();
+        }
+    } grep /\S/, grep !/^\s*#/, readline $fh;
+}
+
+sub command { NEXT }
+
+sub hook_add {
+    my ($class, $cart, $user, $item) = @_;
+    return if defined $user;                   # skip market items
+    return if not exists $item->{product_id};  # skip unlisted, deposit, give, take
+
+    my @warnings = map {
+        $_->( $item->{product_id}, $item->{description} )
+    } _read_warnings;
+
+    if (@warnings) {
+        print "\e[7m>> $_ <<\e[0m " for @warnings;
+        sleep 2;
+        print "\n";
+    }
+}
+