diff --git a/misc-scripts/external_db/external_dbs.txt b/misc-scripts/external_db/external_dbs.txt
index 14cd3cf36a231871d0fab89431c024749b6d1311..4b12717edb8b9cdd4baf4ed5b6eec474f90a0d7c 100644
--- a/misc-scripts/external_db/external_dbs.txt
+++ b/misc-scripts/external_db/external_dbs.txt
@@ -130,6 +130,7 @@
 3128	AFFY_Yeast_2	1	XREF	1	0	1	Affymx Microarray Yeast_2	ARRAY
 3129	AFFY_Rhesus	1	XREF	1	0	1	Affymx Microarray R Macaque	ARRAY
 3130	AFFY_CINT06a520380F	1	XREF	1	0	1	Affymx Microarray C Intestinalis CINT06a520380F	ARRAY
+3131	AFFY_RaEx_1_0_st	1	XREF	1	0	1	Affymx Microarray Rat Exon 1.0 ST	ARRAY
 3200	VB_array	1	XREF	1	0	1	VectorBase Array	ARRAY
 3201	ARRAY_EMBL_MMC1_20k_v1	1	XREF	1	0	1	VectorBase Array	ARRAY
 3202	ARRAY_EMBL_MMC2_12k_v1	1	XREF	1	0	1	VectorBase Array	ARRAY