diff --git a/plugins/smpp-custom/README.md b/plugins/smpp-custom/README.md
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+# Custom options over SMPP
+
+Some operators want additional information sent as the custom TLVs between 0x1400 and 0xFFFF.
+One way to do this is to add a `before_send()` plugin to the connector.
+Such a plugin, as the one shown here, would set the `$sms->{SMPPOPTION}` to a string in the format `key:hexvalue`, where `hexvalue` is the hex encoded version of the value.
+If multiple values need to be sent, `$sms->{SMPPOPTION}` can instead be set to an array of such strings.
+
diff --git a/plugins/smpp-custom/smpp-custom.pl b/plugins/smpp-custom/smpp-custom.pl
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+sub before_send {
+	my ($request, $response) = @_;
+	my $sms = ${$request}{qe};
+	$sms->{SMPPOPTION} = "0x1400:" . unpack("H*","Value");
+	return 0;
+}
+