diff --git a/misc-scripts/external_db/external_dbs.txt b/misc-scripts/external_db/external_dbs.txt
index 7617426e7d7b8d7a8bc1e72f943c0843b4e5e56e..6424c1f6cc5876de90402e9de339b1cd41a3734b 100644
--- a/misc-scripts/external_db/external_dbs.txt
+++ b/misc-scripts/external_db/external_dbs.txt
@@ -127,4 +127,5 @@
 4300	AgilentProbe	1	XREF	1	0	5	Agilent Probe
 4305	AgilentCGH	1	XREF	1	0	5	Agilent CGH
 4400	Xenopus_Jamboree	1	KNOWN	1	0	1	Jamboree
-4500	Tiffin	1	XREF	1	0	1	Tiffin DNA motifs
\ No newline at end of file
+4500	Tiffin	1	XREF	1	0	1	Tiffin DNA motifs
+4600	OTTT	1	XREF	1	0	1	Havana transcripts
\ No newline at end of file