diff --git a/Gen-4-LS.md b/Gen-4-LS.md
index 4caba3e4..2f5cd222 100644
--- a/Gen-4-LS.md
+++ b/Gen-4-LS.md
@@ -4,4 +4,5 @@ https://www.maxxecu.com/webhelp/wirings-pluginecu-chevrolet_corvette_c6_e38_ecm.
 
 x+y+z E67 ECM used 2007+ envoy, trailblazer, saab 97x, rainier, impala ss, and others
 
+https://www.lt1swap.com/pcm_identification.htm