diff --git a/ddr3_controller.sby b/ddr3_controller.sby
index 1902dfa..5303889 100644
--- a/ddr3_controller.sby
+++ b/ddr3_controller.sby
@@ -1,5 +1,6 @@
 [options]
 mode prove
+depth 17 # 13 for 20/5, 17 for 10/2.5, 26 for 5/1.25
 
 [engines]
 smtbmc